Isabella Garcia-Shapiro

Isabella Garcia-Shapiro is the neighbor and one of the best friends of Phineas Flynn and Ferb Fletcher. She lives in Danville on Maple Drive, across from Phineas and Ferb's house, with her mother Vivian Garcia-Shapiro. Isabella has a huge crush on Phineas (though he doesn't seem to notice it. We see that this annoys her when her head "blows up" in France.) and spends most of her days participating or helping with his and Ferb's projects. However she doesn't tell Phineas. She also spends time trying to earn Fireside Girls patches and is also great friends with the members of her troop in the Fireside Girls. She is the female deuteragonist in Phineas and Ferb and is voiced by Disney Channel star Alyson Stoner.

Early life
Isabella Garcia-Shapiro was born to a Jewish Mexican mother Vivian Garcia-Shapiro and an unnamed father. At some point in her life, she met and became friends with Phineas Flynn and Ferb Fletcher. Her friendship with Phineas has somewhere along the way deepened into love and he is now her crush. Though it is unknown when, Isabella joined the Lil' Sparks and later the Fireside Girls and worked her way up to become a troop leader.

Present Life
Isabella lives in Danville on Maple Drive with her mother in the house directly across the street from the Flynn-Fletcher House. She frequently participates in Phineas and Ferb's projects, assisting in construction and maintaining order. Isabella owns and takes care of a chihuahua named Pinky, who she is unaware is a covert agent, like Perry. When on duty, Isabella works diligently upholding her position in the Fireside Girls and earning accomplishment patches. She is currently the captain of Fireside Girls Troop 46231. Its members are Gretchen, Milly, Ginger Hirano, Katie, Holly, and Adyson, with which she is considered not only a leader, but a great friend.

Personality
Isabella is cheerful, fearless, quick-thinking, sweet, beautiful, optimistic, caring, very helpful, and easy to get along with. She is very eager to help with any of Phineas and Ferb's Big Ideas. When she participates with Phineas and Ferb in their endeavors, it's either for the fun of it, her aspiration to earn accomplishment patches, or simply to be with Phineas. She comes over every day just to see him, as seen in the song What'cha Doin? ("Rollercoaster: The Musical!") She is mostly optimistic, but she also cares for, and worries about people at certain times. Isabella is sympathetic and would aid people who are in need of it. This was demonstrated when she showed concern for Candace, who was too nervous to call Jeremy and ask him out ("Out to Launch") and when she snapped Phineas and Ferb out of their hypnotic dullness ("Phineas and Ferb Interrupted").

Being the Fireside Girls Troop Leader, Isabella is a very capable leader. She is level-headed and responsible in the face of emergencies and dislikes being told what to do by anyone, with the exception of Phineas. However, she does gets jealous easily, and will get frustrated if someone that Phineas is giving a lot of attention to other than Isabella or when Phineas expressed seeing Meap as cute but not her ("That Sinking Feeling", "The Chronicles of Meap"). As Isabella enjoys attention, she openly displays envy and discontent when she isn't receiving any, like the time when her Li'l Sparks men-tee, Melissa, showed Candace more attention and admiration than she did with her. ("We Call it Maze") As sweet and adorable as Isabella is, she gets angry fairly easily. One way her temper has been flared was when someone besides her or Phineas would use her catchphrase. In such a scenario, she would express being annoyed and would often confront the violator physically. One such time was when Suzy and Candace repeated her trademark catchphrase "What'cha Doin'?" ("Suddenly Suzy"). Also, when Buford started to use her catchphrase, Isabella elbowed him hard, which made him hurt for a moment ("Out of Toon").

Isabella has shown at least twice that she has a devious streak, taking advantage of a situation for her own benefit. These instances include her immediately jumping on Baljeet's wager of squid versus Buford ("Voyage to the Bottom of Buford"). She also buys a play with the carny Shady Joe when a bowling ball Phineas and Ferb built knocks down all the pins (along with the stand), although Shady Joe is cheating by having the pins taped onto the shelf ("Bowl-R-Ama Drama").

Known Patches in the Fireside Girls troop

 * Troop Leader Patch (This patch is a miniature version of the Fireside Girls emblem. Only worn by past and present leaders)
 * Aquatic Safety Patch ("Lawn Gnome Beach Party of Terror")
 * Sewing Patch ("Run Away Runway")
 * Milking Patch ("The Magnificent Few")
 * Tonsillectomy Patch ("I Scream, You Scream")
 * Tent Pitching Patch, Marshmallow Patch ("Get That Bigfoot Outa My Face!")
 * Aeronautic Patch ("De Plane! De Plane!")
 * Broadcasting Patch ("Let's Take a Quiz")
 * Shrimp Net Repair Patch ("That Sinking Feeling")
 * Passing through a semi permeable membrane patch ("Bubble Boys")
 * Sap Collecting Patch, I Just Saw A Cute Boy Patch, Help thy Neighbor Patch (52 as of Isabella and the Temple of Sap. ("Isabella and the Temple of Sap")
 * Expert Makeover Patch ("Cheer Up Candace")
 * Santa's Helper Patch ("Phineas and Ferb Christmas Vacation!")
 * Mountain Moving Patch ("Phineas and Ferb-Busters!")
 * Rodeo Clown Patch ("Robot Rodeo")
 * Intrepid Reporter Patch ("The Beak")
 * High Wire Patch (Twice "We Call it Maze")
 * Desert Tracking Patch, Rain-forest/Jungle Navigation Patch, Rock-climbing Patch, Non-power Flight Patch, Swift Water Rescue Patch, Concussion First-aid Patch ("The Great Indoors")
 * Whittling Patch ("Phineas and Ferb Interrupted")
 * Golden Year Assistants Patch ("Lotsa Latkes")
 * Flier Delivery Patch (Twice "The Remains of the Platypus")
 * Medieval Siege Engine Patch (First patch earned "Doonkleberry Imperative")
 * Unearthing Ancient Container Patch ("Meapless in Seattle")
 * Magic Patch ("Doofapus")
 * Eating A Grub Patch ("Where's Perry?")

Physical Appearance
Isabella is a very slender child with long, black hair with thin blue hi-lights and a rounded bottom, fair skin, and oval dark blue eyes and a flat top. As a baby, she wore a pink t-shirt and had her hair tied up in a straight bun. ("Agent Doof") She wears a fuchsia-pink sleeveless dress that stops above her knees, revealing that she has long legs, like Ferb, with a white short-sleeve T-shirt underneath and a deep purple belt, white socks and pink shoes with white laces. The pink bow in her hair is thought to be her trademark, and she has only been seen without it on a few occasions, but not without it on her head. (See background information below.) Her Fireside Girls uniform is the same format as her normal clothing, with the exception that her dress is half orange and half brown. She wears an orange beret with a red bow in the front. Underneath is a red bow. Her belt is red, and she has a light yellow accomplishment sash with three shaped patches consisting of a teal diamond, a teal oval and a gold triangle from top to bottom, respectively. Her shoes are red with yellow laces.. Her pajamas are light purple with darker purple stripes, and she wears a purple bow.

She has been in more winter outfits than any other character in the show. Four of the more notable winter outfits are:
 * 1) In the song S'Winter (Seen above), she wear a purple fleece jacket, a pink miniskirt and pink shoes and her white socks with skates.
 * 2) In the book "Oh Christmas Tree!", she wears a pink bow, a pink jacket, a white skirt, pink legwarmers, and white shoes, pink mittens and a pink/white earwarmer with this outfit.
 * 3) In "Phineas and Ferb Christmas Vacation!", she wears a purple hat, purple bow, purple coat, purple scarf (loose wrap), purple mitten, and white boots.
 * 4) In "A Phineas and Ferb Family Christmas", (Shown in the songs section below) is a mulberry colored dress with a white turtleneck sweater underneath, purple leggings and off-white fur boots, and wears a purple hat with pale pink bow, purple coat, pale pink scarf (loose wrap), pale pink mittens, and white boots while outside in the snow. She does though change her outfit several times in the episode. See the background info section of that page for the full list.

In most episodes she does appears in, she is slightly taller than Phineas, but in a select few episodes, she is the same height or actually slightly shorter than Phineas. For swimming, her swimsuit typically consists of a fuscha-pink, one-piece bathing suit and her trademark pink bow, although she has been seen with three other swimsuits: A red one ("Lawn Gnome Beach Party of Terror"), a yellow one with a (Spot the Diff episode "Lawn Gnome Beach Party of Error", and a purple one, though only seen briefly ("Ready for the Bettys"). When she plays soccer, she wears a yellow and white shirt with the white mostly at the bottom of the shirt, yellow and white shorts, a yellow bow, changes her hair to be a ponytail that shows her ears, white cleats, black socks, and a yellow hair tie for the ponytail. ("My Fair Goalie")

Phineas Flynn
Isabella has a big crush on Phineas. Phineas' feelings for Isabella though, are somewhat unclear, although his feelings seem to have gone from completely oblivious to romantic as time passes. She has many romantic daydreams about him and also believes she will one day marry him, but she gеts angry if Phineas, with his obliviousness, can't notice her hints flirting with him, which is generally whenever she acts romantically around him ("One Good Scare Ought to Do It!", "Candace's Big Day", "Comet Kermillian", "Phineas and Ferb's Quantum Boogaloo", "Isabella and the Temple of Sap", "Hide and Seek", "The Beak", "Phineas' Birthday Clip-O-Rama!", "Phineas and Ferb The Movie: Across the 2nd Dimension". "Meapless in Seattle"). She cutely greets him with the phrase "What'cha doin'?" She has even directly referred to Phineas as "The very thing she lives for." ("Isabella and the Temple of Sap") Also, Isabella revealed in the song What'cha Doin'? that she is always dying to come over to his house to see him and ask 'What'cha Doin'?' and that she specifically says it to Phineas and not Ferb. She does this because it is for capturing Phineas' attention. Isabella swooned for "The Beak" a few times during "The Beak's Theme Song", not realizing that it was still Phineas she was swooning for.

One example of this is when Isabella and Phineas were alone in Paris looking for parts, and Isabella was trying to be romantic, but Phineas seemed very oblivious to her. Then when the boat crash landed on the deserted island and Phineas tried to find something to fix the boat, Isabella began crying because Phineas didn't even take notice of her and she would have given anything for Phineas to sit down next to her and enjoy the sunset. Then Phineas ran up next to her, having a small mental breakdown, desperately thinking of an idea to get off of the island. Figuring that none of the ideas would work, he gave up hope entirely and sat down with Isabella to enjoy the sunset with her. Seeing how broken Phineas was, Isabella realized that this wasn't the amazing kid she had fallen in love with, so she gave him a pep talk, and almost admitting her love for him in the process, but she quickly caught herself and said something else. She then mentioned Ferb's map and Phineas thanked her for the inspiration with a hug, leaving her in a trance. Later when they make it back to Danville, Isabella hugs Phineas for regaining his confidence to achieve his goal. Not even 30 seconds later they sing a duet (Summer Belongs to You!) with Phineas taking her hand several times and also showing several signs that he returns her feelings for him ("Phineas and Ferb Summer Belongs to You!")

However, when Phineas constructs a device to find cute things to search for Meap, he says he had took Isabella's cuteness into account and adjusted the settings accordingly ("The Chronicles of Meap"). When he puts the settings back to normal, the device overloads from an excessively strong cute signal from her. She uses her position as Fireside Girls troop leader to stay near him and participate in his Big Ideas, under the guise of earning the "Help Thy Neighbor" patch (which she has earned at least 52 times). It is unsure whether Phineas has the same feelings towards Isabella, but mostly he seems oblivious. Phineas feels bad about ditching her, and also says that he cannot tell her he is The Beak because she is "close to him" ("The Beak"). Phineas is sometimes worried about Isabella getting hurt ("Gaming the System", "The Beak", "Der Kinderlumper") Also, when Isabella tells Phineas he is brave, he replies with, "You were too!" She learns that she will be aunt to Candace's children. Although who she married was unknown, it will most likely to be Phineas or Ferb, since Phineas and Ferb is now being shown returning Isabella's feelings. She sometimes disguises her affection for them (but very rarely) like hugging him in a crowd when everyone is hugging Perry, Isabella hugs Phineas and instead of Perry ("Oh, There You Are, Perry").

She sometimes disguises her affection for him (but very rarely) like hugging him in a crowd when everyone is hugging Perry, Isabella hugs Phineas instead ("Oh, There You Are, Perry"). In "The Great Indoors", Phineas helps Isabella get patches after rain spoils her plans to get them, which had made her sad. The rain was caused by Heinz Doofenshmirtz's Rain-inator. In "Canderemy", Isabella wanted Phineas to go to a sold-out Stumbleberry Finklebat movie, but Phineas interrupted her so he could finish his robo-dog (as seen in the short version of Today is Gonna Be a Great Day). At the end Phineas goes with her, but with Ferb combined with him from Heinz Doofenshmirtz's Combine-inator.

While on hot air balloons, Isabella's balloon is behind Phineas's. Isabella asks him what he's doing, seeing him fidgeting with something on his balloon. He explains that his wheel is broken, but he stops talking because he heard something behind him. He turns around to see Isabella, who asked if he needs help fixing it and somehow got from her balloon to his. Phineas replied, asking her to hold the wheel still. Isabella immediately jumps on the opportunity and holds the wheel still, obviously overjoyed that she can put her arms around Phineas. Phineas didn't seem to mind, and replied by saying she is holding it perfectly, partially hinting that he likes having her arms around him. Isabella smiled and they stay in the same balloon together for the rest of the ride ("Last Train to Bustville").

On Phineas' birthday, Isabella helps create a digital video for his birthday. She created some digital editing voices for herself when Phineas' quoting: "We´ll be together forever Isabella" and "Isabella, will you marry me?". Later that day, Phineas stateed that he enjoyed being around the people he loves. While he says this, a tear runs down Isabella. This may mean that Phineas may like her now as more than a friend. ("Phineas' Birthday Clip-O-Rama!")

Phineas explains that the teleport function of his and Ferb's prototype cellphone, built for Candace, will "take you to the place or person you're trying to reach." He demonstrates this by asking Isabella to stand on the driveway, to which she willingly agrees. Phineas specifies Isabella's name to the phone ("Go to: Isabella"), and is transported directly beside her - so close, in fact, their noses touch. Isabella asks Phineas what he's doing ("Hey, Phineas. What'cha doin'?"), to which Phineas responds "I'm transporting!" Neither flinch, pull their noses away, or appear flustered throughout the exchange. Isabella seems very pleased with the close contact - that is, until Phineas transports back to the garage and she angrily replies with a "Dang it!" ("Candace Disconnected"). As the song Aerial Area Rug starts, Phineas reaches out for Isabella's hand to help her onto the flying carpet. They are also seen looking into each other's eyes, lying down close to each other, or just sitting down together away from everyone else throughout the duration of the song. ("Magic Carpet Ride")

Near the end of the 2011 Disney Channel Original movie, when Isabella and several others were lined up to have their memories of witnessing Perry as a secret agent erased, Carl is going to wipe the memories of everyone who found out that Perry was a secret agent using a machine called the "amnesia-inator". Isabella asks Major Monogram if the machine would make them forget everything that happened that day, he assures her of it, and she kisses Phineas. However Phineas doesn't show any affection or doesn't remember nor does Isabella. Which it doesn't count that they show they love each other or have affection. She then tells Carl to fire up the machine, much to the dissatisfaction of Phineas. Right afterwards, Phineas objected to having their memories erased and proceeds to cry out "Wait, wait, WAIT", only to be ignored. This shows that he didn't want to forget that moment, and that he may have feelings for Isabella after all and that would also mean that Phineas would have preferred to remember the kiss than lose Perry.

In the episode "Ferb Latin", Phineas and Isabella danced and sang together while singing the Ferb Latin song about the new language, Ferb Latin, and he smiled at her sweetly. They also touched their shoes while singing the song. As Isabella walks towards the stool to sing Let it Snow, Let it Snow, Let it Snow, Phineas looks at her endearingly. The song Let it Snow, Let it Snow, Let it Snow has a romantic nature and during the song, Isabella lightly kisses a snowman shaped like Phineas on the nose. The snowman quickly melts after she does this. She also forms a heart with her fingers around a Phineas-shaped silloette in a window. ("A Phineas and Ferb Family Christmas"). When Phineas first sees Princess Isabella, he dreamily admires her. Then, when Phineas and Ferb come to rescue her from Doofus Khan, she thanks and hugs Phineas. After the escape, Doofus Khan finds them again and Isabella hides behind Phineas; they escape together after Doofus Khan's dragon fell on top of the giant terracotta warrior after the battle. However, these events partially don't count due to the fact that this episode is in a parallel world. ("Doof Dynasty")

Phineas carries Isabella to safety while trying to evade threatening laser beams. Later, when Phineas becomes hypnotized by Mitch's cuteness, Isabella is the only one able to snap him out of the trance. Phineas alludes to Isabella's own cuteness as a 'scientific fact', also claiming that it 'goes right to her core'. ("Meapless in Seattle") Phineas and Isabella share a jet ski when following Candace and Crikey through Danville sewers and canals. They're constantly smiling at each other during the ride and he is holding her shoulders for support. Also, when he and Irving somehow switched places during the ride, he seemed a bit disappointed when he noticed he wasn't with Isabella anymore. ("What A Croc!")

Potential Marriage
When Phineas, Ferb, Isabella, and Candace time-traveled to the future, Candace's future daughter Amanda noted that Isabella looks like "Aunt Isabella". Thrilled, Isabella realized that she will marry into the Flynn-Fletcher family in 20 years and exclaimed to Candace that she must have married Phineas. However, Candace reminded her that she could have married Ferb, which sent Isabella into speechless shock ("Phineas and Ferb's Quantum Boogaloo"). When Candace was planning her Aunt Tiana's wedding, Phineas said, "I got to have her plan my wedding. Ferb, make a note of it," to which Isabella (who is off-screen) interrupts with, "I got it," indicating that she intends to one day marry Phineas ("Candace's Big Day"). Many of her dreams always end with Phineas asking her to marry him ("Isabella the Hero").

Possible Relationship
As of for season 3, Jeff and Dan had announced that Phineas and Isabella's relationship would happen and was explored further.

Ferb Fletcher
Isabella is best friends with Ferb, likely because he's the stepbrother of her crush, although she seems to get annoyed when Ferb goes with Phineas. Along with Candace, she has outright stated that Ferb is Phineas's stepbrother ("Rollercoaster"). Unlike her time with Phineas, Isabella shows no romantic interest in Ferb although she does like him. However, after time-traveling to the future, she learned that she might marry either Phineas or Ferb ("Phineas and Ferb's Quantum Boogaloo"). Upon this discovery, Ferb turned around and winked at Isabella, who was stunned at the possibility that she may marry someone else other than Phineas. This may indicate that Ferb may harbor a bit of affection for Isabella, or that Ferb just fancies himself a ladies' man ("Thaddeus and Thor").

It is also possible he was simply teasing her. Ferb is slightly irritated and gets mad when Phineas gets all of Isabella's attention and praise for being a superhero ("The Beak"), but it can be just the thought of him being the one who controls the lower half and saves Danville from the falling sign, but Phineas gets all the attention. When they were stranded on the uncharted island, Ferb listened while Isabella talked about Phineas not noticing her and offered her a handkerchief when she started crying. He knows about Isabella's crush on Phineas and he also walked away when Phineas came to leave them alone. He may might not have any affection to Isabella however he knows he might get married with her. ("Phineas and Ferb Summer Belongs to You!", "The Doof Side of the Moon"). It is most likely that he does not have affection for Isabella since he has more affection for Vanessa Doofenshmirtz ("I Scream, You Scream").Though he thinks he doesn't have a chance to get Vanessa's love. Ferb has also demonstrated awareness of Isabella's affection for Phineas; after Ferb helped Phineas throw a party for Isabella, when Phineas offered her ice cream with Ferb, he left to have Phineas and Isabella have some alone time together. Isabella was pleased and both bumped fists. ("Happy Birthday, Isabella")

Baljeet
Isabella is friends with Baljeet. They hang out on occasion, usually when they are brought together by Phineas and Ferb's Big Ideas. She won a bet against him on who would win the fight between Buford and the squid ("Voyage to the Bottom of Buford"). Though when trying to find the purpose of a machine Baljeet did jump at the chance to have a romantic dinner with Isabella, even a staged one. Isabella told him he ran at the table ("What Do It Do?"). This is also hinted when Baljeet asked Isabella if he made a good Phineas, she responds with "No, no you weren't." ("Not Phineas and Ferb").

When Phineas and Ferb built a super computer, Isabella is seen thinking about Phineas on the super computer. This makes Baljeet mad, showing he may have a crush on her ("Ask a Foolish Question"). While attempting to climb Danville Mountain, Isabella shows significant enthusiasm for Baljeet's eagerness to perform the task without the help of any Flynn-Fletchers' inventions, which stands in contrast to the attitude of Ferb and, especially, Phineas ("Bully Bromance Break Up").

Buford Van Stomm
So far, Isabella is the only character to stand up to Buford and has done so regularly ("Raging Bully", "Got Game?", "Gaming the System", "Out of Toon"). However, she showed deep sympathy when he was left emotionally broken during the loss of his goldfish and knew without a doubt he'd win in a confrontation against a giant squid. ("Voyage to the Bottom of Buford")

Isabella believes without a doubt in her mind that Phineas, though she has faith in him, would be left seriously injured after a fight with Buford. ("Raging Bully") Isabella has demonstrated dominance over Buford in video games, as she over-powered in a one-on-one fight ("Brain Drain") and single-handedly annihilated a giant virtual video game boss version of Buford. ("Gaming the System")

When Buford said her catch phrase, she elbowed him very hard in the arm but when Candace and Suzy said it she got mad but not physical showing that it's a bigger deal in her mind for what ever reason that maybe. ("Out of Toon") When Buford hide behind her from the giant squid, Isabella didn't even notice the squid or the fact that Phineas and Ferb are missing. She just cared that Buford found Biff. Of course, this could just be obliviousness and nothing more.("Voyage to the Bottom of Buford")

When Phineas and Ferb were explaining about the weather, Baljeet became 'hypnotized' and Isabella snapped him back to reality. When Buford also became 'hypnotized', Isabella slapped him, causing Buford to thank her. ("Phineas and Ferb Interrupted") When she had a hold of someone's hand in the dark then found out it was Buford's not Phineas', she had a negative reaction in the form of a loud "EW!". ("That's the Spirit")

Candace Flynn
Isabella and Candace are good friends. They both know about each other's respective crushes and share advice and experience ("One Good Scare Ought to Do It!", "Out to Launch", "Phineas and Ferb's Quantum Boogaloo", "Phineas and Ferb-Busters!", "Phineas and Ferb Summer Belongs to You!"). While in Paris, however, Isabella felt and displayed envy of the time Candace was able to spend with Jeremy. ("Phineas and Ferb Summer Belongs to You!")

When Isabella was delighted to know she was being called 'aunt' by Candace's future children, initially believing she'd grow up to marry Phineas, Candace responded saying there was the possibility it wouldn't be Phineas she would marry, but rather Ferb ("Phineas and Ferb's Quantum Boogaloo"). Candace teamed up with Isabella to beat Buford and Baljeet ("Got Game?"). Isabella, Phineas, and Ferb also helped Candace get a ticket to the Paisley Sideburn Brothers Concert ("Fireside Girl Jamboree"). Even though they like each other in general, Isabella was mad at Candace when Melissa was more interested in Candace's achievements than Isabella's, yet they became reconciled when Candace admitted that if it were not for Isabella, she would have never gained 50 Accomplishment Patches in a single day ("We Call it Maze"). Interestingly enough, Candace doesn't try to bust Isabella when Baljeet and Buford pose as Phineas and Ferb, even though she acknowledged that Isabella was in the backyard ("Not Phineas and Ferb"). This may mean that they are very good friends. In a future episode, revealed during a talk session with some of the Phineas and Ferb cast and creators on July 9, 2011 in New York City, Isabella will ask Candace for romantic advice. When she is sad or worried, including when her dog Pinky was missing, Candace acted like a big sister to her as she tried to cheer her up, letting her know that Pinky will turn up like Perry does ("Where's Pinky?").

Fireside Girls
As the troop's leader, the Fireside Girls always follow Isabella's orders, always ready, and willing to do whatever it takes to help their leader in helping Phineas and Ferb, even risking themselves to do it, like driving a van to get sap ("Isabella and the Temple of Sap"). Although the girls are loyal to Isabella, and have earned many badges in helping the boys, they have voiced that they've collected more than fifty of the 'helping thy neighbor' badge because of it. They're also aware of Isabella's crush on Phineas and her desire to marry him, and they jokingly tease her for it ("Isabella and the Temple of Sap"). Even so, they remain friends with the boys and squealed with delight when Phineas invited Isabella on a romantic cruise ("That Sinking Feeling"). Also, Gretchen sometimes reminds her of what they were going to do when the troop needed to get sap from a rare tree so the troop can earn their "Sap Collecting Patches"("Isabella and the Temple of Sap").

Jeremy Johnson
Jeremy seemed to like Isabella's idea in "Got Game?" about Candace being on Isabella's team. He also called her Miss when he wanted a table for him and Candace in "Chez Platypus".

Stacy Hirano
Not much is known about their relationship, but Isabella knows what Stacy and Candace were going to do one day. ("Spa Day") She also knows her name. ("Rollercoaster: The Musical!")

Heinz Doofenshmirtz
Even though they are rarely seen at the same time, Isaabella directed him and his evil date to a table in "Chez Platypus". In "Wizard of Odd", Doofen witch Warlock wanted the boots from a crushed Suzy Johnson that were on Candace, but Isabella (as the Good Witch) said he had no control in the area has was in.

Perry the Platypus
Isabella petted Perry in "Rollercoaster", saying that Phineas and Ferb could teach him some tricks. She also sang Come Home Perry with the boys, suggesting she likes him as well, even though she has Pinky as a pet. ("Oh, There You Are, Perry") She petted Perry again in "Phineas and Ferb The Movie: Across the 2nd Dimension" while hitting a baseball off of him out of the backyard.

Pinky the Chihuahua
Isabella likes Pinky and feeds him grilled cheese, but he, like most other dogs will run after cats ("Journey to the Center of Candace"). Isabella also seems to have given him some orders to him as he almost ate Candace, but Isabella told him to stop, which Pinky did.("Hide and Seek") She also took him to the Fireside Girls clubhouse one day, but he left since he was an O.W.C.A. agent. ("Isabella and the Temple of Sap")

Irving
Isabella was originally neutral to Irving, but as of "Phineas' Birthday Clip-O-Rama!", she seems to be more of a friend to him. In "Misperceived Monotreme", he thinks Isabella is cute.

Jenny
Jenny doesn't appear as often as the other characters do, but Isabella seems to know her name ("Rollercoaster: The Musical!").

Mitch
Isabella seems to be an enemy to him, since he is a poacher and she thinks that is wrong. ("The Chronicles of Meap") In "Meapless in Seattle", Isabella beats Mitch using only her cuteness.

Wendy Stinglehopper
She seems to know her as she said that she was the pretty girl on the math team (of which Baljeet may be in as well). However since Wendy was in only one episode and Isabella was never seen with Wendy, they have never interacted yet. ("Phineas and Ferb Christmas Vacation!")

Carl and Francis "Major" Monogram
Isabella treated Carl like a guest in "Undercover Carl" and played with him the most in the episode. She also said hi to his fake dad, who was Monogram. She also stopped Carl for a moment to give Phineas a kiss, then she told Carl to hit the memory-earasing ray that would erase the memories on those that saw Perry as an agent ("Phineas and Ferb The Movie: Across the 2nd Dimension").

Take Two with Phineas and Ferb
In this live-action/animated spinoff of Phineas and Ferb, Isabella is a stage manager and in some episodes is seen only once, but unlike the show she was first in, she has been seen in every episode so far. Some other times, she is helping out such as getting a soccer ball to a guest and screaming with the others. In the Howie Mandel episode, she accidently broke a window while trying to get a baton to him.

Phineas and Ferb The Movie: Across the 2nd Dimension
In this 2011 Disney Channel Original Movie, Isabella is first seen opening the back gate to the Flynn-Fletcher house and says her catchphrase. She skips over to pet Perry, of which Perry launches a baseball to out of the backyard that was on him, of which Phineas is impress at her skill, and the ball lands in Baljeet's hand. She helps Phineas and Ferb work on a platypult, and after they work on it for a while, she noticed Perry was gone. When Perry throws a rock so he can see Major Monogram, she and the other kids wonder what the sound was. Later. Isabella spins a lever to make the platypult's tail go flat with the ground, which is holding a large birdie Phineas and Ferb are on. A few seconds later, she then presses an involutary reflex button that launches Phineas and Ferb in to the Danville skies and it gets the boys to Heinz Doofenshmirtz's building, since Perry hit it nwith his new rocket car he got while the platypult was being launching. When Candace and Stacy get in the backyard, Isabella says she doesn't know where the platypult went, which was there a moment prior. She, Baljeet, Candace, and Stacy then head to the park.

She isn't seen again until the four are at the park while Phineas, Ferb, Perry and Heinz are in 2nd Dimension with Buford, who considers not returning a serve is a forfeit in platypult badmition. She watches Buford and Baljeet trade cards after Candace and Stacy go back to the Flynn-Fletcher house, of which that is where they stay until Phineas, Ferb, Candace, Agent P and Heinz 1 come back from dimension-traveling. She wonders where they have been, of which Phineas replies they (referring to him, Ferb, Candace, Agent P and Heinz 1) have got back home. All the people from the park, including Isabella, notice that the Norm Bots Heinz-2 has unleashed. When everyone is on the inventions in the Robot Riot scene of the film, Isabella helps destroy 18 Norm Bots using the horse she rode in "Ain't No Kiddie Ride" (which was destroyed) by hitting one of them in the front, of which then smashed into the others. After doing a flip from going off the kiddie ride, she is happy about taking down, she pumnps her fist and says "Yes!" She does another flip below a Norm Bot that was just destroyed by her while she had a baseball launcher in her hands and told Ferb to help Phineas, saying she and the others will take care of the robots. Just after Phineas defeats the Norm Bots that are falling like rain drops, she talks to Buford, thinking that it is weird that Perry is a secret agent. She, like all the others, including Candace and Stacy, agree to have their memories removed instead of losing Perry to be relocated, once they are on the top floor of Doof-1's building.

After Isabella confirms with Major Monogram about that they will be losing their memories for that day, she says "Good!", and then she kisses Phineas, knowing that their memories will be erased soon thereafter. Phineas's response to the sudden, startling kiss turns out to be very intriguing as he instantly exclaims, "Isabella!" with a smile on his face, and once Isabella gives the OK for the day to be forgotten, he cries out, "Wait, wait, WAIT"- just as the amnesia-inator's ray hits them. The fact that his immediate reaction would be so pleasant hints that he has now just considered returning Isabella's affections. Also, his next step of action was to beg for the memory-erasing to be cancelled, or at least stalled, making it clear that he wanted to say (or do) something very important according to him. Something else to take into account is that Phineas had just agreed to sacrifice remembering the "best day ever" so that Perry could remain his pet. If he was about to request for their memories NOT to be erased, then in that split second, he was viewing his relationship with Isabella as more important than Perry's secret. Also interesting: if he wasn't considering to remember the whole day, but at least keep this one memory, then it is technical proof that Phineas does want to be "more than just friends" with Isabella and wants to form a real relationship. However, since the entire day was in fact erased from their memories, then it is unknown whether Isabella's kiss sprung open these feelings inside Phineas, or if these feelings are already laying in him, albeit being dormant/undiscovered.

Phineas and Ferb and Phineas and Ferb Ride Again
Isabella is a non-playable character in both games, but is seen off and on throughout the game. She also appears in the credits in Irde Again woth her Firesidde Girls troop, who are unnamed in the credits.

Wii/PS3 version
She has her most time on-screen in this version of the game based off the movie. She is first seen in her Old-Timey and Lawn Gnome outfits (From the Old-Timey and Lawn Gnome dimensions) and becomes a playble charactrer after the player goes into the Norm Bot factory and buys her for 100 tickets from playing with the crane game or Perry-ball.

There are also some statues of Isabella that are buyable using tickets: Regular Isabella, Animal Lover Isabella, old-Timey Phineas and Isabella, and Lawn Gnome Isabella with Baljeet. Her favorite weapon to use in the game is the OWCA beacon and her ability is to give out extra tickets when playing games. This is needed to get 100% for the game.

DS version
She is not a playable character, but just like the other 2 DS games, she is seen off and on in the game, although less often compared to the first two and does not speak with a voice, just a dialog line. Talking to her fully heals your characters.

Phineas and Ferb: Quest for Cool Stuff
She is expected to appear in the upcoming game, though no images have been shown with her in the image.

Delevopment
Though not much is know of how Isabella came to be, there are two types of her before her current design: The first version (top) has her with brown hair, a light blue dress, a yellow bow, and a yellow belt as she, Phineas, and Ferb are entering Earth. The second version (bottom) has her in a red shirt or dress, short darker brown hair, but the same yellow bow. Alyson Stoner said that Isabella could have a new outfit for season 4, explaining she could have a green dress instead of a pink one, but was not true.

Skills and Abilities
Isabella has displayed numerous skills and abilities as shown below. She appears to be very physically capable, being a fast runner ("Candace Loses Her Head", "Journey to the Center of Candace"), and also remarkably strong, having been able to hurt Buford by elbowing him and crushing a pencil. ("Out of Toon", "Phineas and Ferb Summer Belongs to You!")
 * Isabella is a very fast runner. ("Candace Loses Her Head", "Journey to the Center of Candace")
 * Isabella is very strong for a girl her age, as she is seen holding Phineas in her hands ("One Good Scare Ought to Do It!"), can actually hurt Buford (a very tough bully) just by elbowing him ("Out of Toon"), can lift a book that is much larger than her ("Fireside Girl Jamboree"), with Baljeet's help, lift the seats from the Sun-Beater 3000 onto the paper airplane and is seen breaking a pencil with only her fist, ("Phineas and Ferb Summer Belongs to You!"), and can also lift a heavy processor without help, which only she and Buford can lift it, while Baljeet just fell down.("Ask a Foolish Question")
 * Isabella owns roller skates and knows how to use them ("Bowl-R-Ama Drama").
 * Isabella has shown an expectional musical talent as she is an excellent singer ("S'Winter", "The Magnificent Few", "The Ballad of Badbeard", "Phineas and Ferb Summer Belongs to You!", "Wizard of Odd", and in several other episodes). Also in several of the songs, you can hear her singing alone. ("Where Did We Go Wrong?", "City of Love", "We Wish You A Merry Christmas", etc.) and she can play various musical instruments including;:
 * The tambourine, ("The Fast and the Phineas," "Don't Even Blink" and in other episodes.)
 * The trumpet ("Don't Even Blink")
 * The guitar and the key-tar with her right hand ("Tip of the Day", "Gaming the System," "Oh, There You Are, Perry" and in other episodes).
 * The saxophone ("Take Two with Phineas and Ferb: Cedric the Entertainer")
 * The violin ("Out to Launch" A Phineas and Ferb Family Christmas")
 * She can also dance well, almost based on her voice actress ("Robot Rodeo"). She has also danced in "Put That Putter Away", "Day of the Living Gelatin", "Spa Day", "Fireside Girl Jamboree", and other episodes.
 * Isabella is able to tell when someone else says her catchphrase, "What'cha doin'?", even when she is not near the person. She gets very upset if someone says it except for Phineas, ("I Scream, You Scream", "At the Car Wash", "That Sinking Feeling") and she does not let anyone say it to Phineas ("Out of Toon", "Suddenly Suzy", "Tri-Stone Area"). She also feels a disturbance whenever somebody else says it ("Phineas and Ferb Christmas Vacation!"(a variation of the Psyco theme plays)). Baljeet says it once to Phineas, but Isabella was not around and he said, "I sounded just like Isabella" ("Bowl-R-Ama Drama"). Buford once tried using Isabella's phrase but Isabella elbowed him before he could finish ("Out of Toon") Likewise, Isabella is not stopped by Phineas when she says his catchphrases in episodes such as "The Chronicles of Meap", "Cheer Up Candace", "That Sinking Feeling", and others. Isabella seems has a monopoly of the catchphrase, "Whatcha doin?"
 * Isabella was the business agent for Phineas and Ferb when they direct a movie, which implies she is skilled in business. ("Lights, Candace, Action!") She does the job exceptionally well, even though she is only seen in the episode for a few seconds and only for that part.
 * She has certain knowledge over being able to fly a small jet aircraft, like a fighter jet ("Phineas and Ferb Christmas Vacation!"), although she admits to being legally too young to drive ("The Secret of Success") despite possessing a remarkable knowledge over the anatomies of automobiles ("The Fast and the Phineas," "The Secret of Success").
 * Isabella is good at table football ("Got Game?").
 * She can whistle with two fingers ("S'Winter", "The Fast and the Phineas").
 * As shown in "Phineas' Birthday Clip-O-Rama!", Isabella knows how to edit videos, and can also recite somewhat disturbing blues poetry, at least about her Fireside Girls troop being under-equipped. The poem is a parody of the Allen Ginsburg poem Howl.
 * Isabella is a great soccer player. Her skills were shown in the episode "My Fair Goalie".
 * Isabella is clear-thinking when she is the middle of emergencies. She saved Phineas from a perilous fall by having the Fireside Girls bind their sashes together ("One Good Scare Ought to Do It!"), got everyone running for safety when Doofenshmirtz's Big Laundry experiment went awry ("Swiss Family Phineas"), and she did a water rescue and administered first aid in the bio-dome on Adyson ("The Great Indoors"). When Phineas and Ferb were dull and boring due to Doofenshmirtz's Inator, Isabella was the only one of their friends to not be affected in any way when listening to Phineas and Ferb talk boring. Also, she was the only one who persuaded Phineas and Ferb to "think creative" in order to save Candace from falling ("Phineas and Ferb Interrupted"). Also, when a giant video game version of Buford was threatening her friends, Isabella bravely stood up to it and defeated a giant video game Buford with a digital camera. ("Gaming the System")
 * She knows how to ice-skate. ("S'Winter", "A Phineas and Ferb Family Christmas")

Background Information

 * There is plenty of evidence that Isabella is at least part Jewish. Her last name is Shapiro, traditionally a Jewish name. She has a mirror in her room that has a Star of David frame; this is a common symbol for Judaism. In addition, Isabella's mother, Vivian Garcia-Shapiro, went to a Mexican-Jewish Cultural Festival and often uses Yiddish phrases. Isabella says she celebrates Hanukkah instead of Christmas ("Isabella and the Temple of Sap", "Picture This", "Phineas and Ferb Christmas Vacation!”, "Phineas' Birthday Clip-O-Rama!", "Lotsa Latkes", "A Phineas and Ferb Family Christmas")
 * Unlike her mother, she speaks fluent English with a perfect American accent.
 * Isabella's outfit is similar to Helga Pataki's of Hey Arnold.
 * She has a Jewish grandmother named Nana Shapiro. ("Lotsa Latkes", "A Phineas and Ferb Family Christmas")
 * Isabella appeared as the good witch in "Wizard of Odd." During that episode, she wore a pink dress with a pink tiara white ballet slippers, and a wand. She traveled through a floating eyeball as the good witch and her friends were the Patchkins.
 * The character is named after series creator Dan Povenmire's oldest daughter who loves the show and enjoys that Isabella is named for her.
 * She is voiced by Alyson Stoner, who also does the voice of a lesser extent character, Jenny Brown.
 * In some later episodes (such as She's the Mayor), when she says "Whatcha doin'?" her voice becomes high-pitched. However, her original voice is used in some episodes ("Rollercoaster: The Musical!" is one of them to have her original voice).
 * Isabella has the least absences in Phineas and Ferb's friendship group. A total of 39 episodes; she was absent for 11 episodes (and one 2-part episode) in Season 1, 13 episodes (and three 2-part episodes) in Season 2, 7 episodes (and one 2-part episode) in Season 3, and one episode so far in Season 4.
 * Most of time in the end credits from Season 1 and the first half of Season 2, her name is misspelled as "Isabela" with one "l" instead of two.
 * Isabella has a pool in her backyard ("Rollercoaster", "Ready for the Bettys", "Day of the Living Gelatin").
 * Isabella has a Chihuahua named Pinky who is revealed to be a secret agent in the O.W.C.A. like Perry ("Journey to the Center of Candace", "Comet Kermillian", "Interview With a Platypus", "Day of the Living Gelatin", "Hide and Seek", "Isabella and the Temple of Sap", "Rollercoaster: The Musical!", "Phineas and Ferb The Movie: Across the 2nd Dimension"), "Where's Pinky".
 * Isabella is descended from a girl that looks exactly like her, who was friends with Dr. Phineastein and Ferbgor and had a picnic with the boy's big idea, a platypus monster (“The Monster of Phineas-n-Ferbenstein”).
 * A future episode, which was mentioned by the creators, will have Isabella ask Candace for relationship advice.
 * Her mother, Vivian Garcia-Shapiro calls her "Isa" for short. This is a common shortening of her name in many Spanish-speaking countries ("Hide and Seek").
 * Her signature look and her Fireside Girl uniform switch on occasion ("Flop Starz", "The Fast and the Phineas", "Candace Loses Her Head", "The Flying Fishmonger", "At the Car Wash", "Candace's Big Day", "Robot Rodeo").
 * She is the leader of Fireside Girls Troop 46231 ("Isabella and the Temple of Sap").
 * She was seen younger for the first time in "Agent Doof".
 * She can use a much deeper voice, which can scare an unprepared listener ("It's a Mud, Mud, Mud, Mud World", "For Your Ice Only").
 * "Robot Rodeo" reveals that when her hair frizzes when it is exposed to humidity.
 * She seems to have an obsession with horses, especially fantasy colored ones or unicorns as shown in the episodes "The Magnificent Few", "Out of Toon", "Hail Doofania!", "Isabella and the Temple of Sap", and "Ain't No Kiddie Ride".
 * "Jerk De Soleil", "Phineas and Ferb Christmas Vacation!", and "The Beak" shows that she reads the newspaper.
 * She has been seen without her bow on a few occasions: as a pirate in "The Ballad of Badbeard", as a "ninja of love" in the performance of You Snuck Your Way Right Into My Heart in "Dude, We're Getting the Band Back Together", in a horse costume from "Got Game?", serving as a flight attendant in "De Plane! De Plane!", while wearing rain gear during "Phintastic Ferbulous Car Wash" in "At the Car Wash", wearing a fedora in "The Beak"), in foreign costume during the song Bouncin' Around the World as well wearing a beret in City of Love in "Phineas and Ferb Summer Belongs to You!"), playing the Good Witch in "Wizard of Odd", her desert outfit in "The Great Indoors", when she was dressed as a fairy princess for Halloween in "That's the Spirit" for the that entire episode, and "Excaliferb". Isabella never wore her bow in "The Beak", though it may have been under her hat. Though, she was seen without her bow briefly in a scene from "Gi-Ants", but that was an error.
 * She gets jealous when all credit or attention is taken away from her. Examples of this can be found in "The Chronicles of Meap", "That Sinking Feeling", and "We Call it Maze".
 * She seems to have a short temper. An example of this is when she broke her pencil out of anger in "Phineas and Ferb Summer Belongs to You!"
 * She owns a Mindy doll in "Picture This" and a "Quick E Bake Oven" in "No More Bunny Business".
 * She was once a member of the Lil' Sparks and is now mentoring Melissa as revealed in "We Call it Maze".
 * Dr. Doofenshmirtz comments that in the "The Chronicles of Meap" Character Commentary, he thinks Isabella is full of herself but cute as well.
 * She is most likely a Stumbleberry Finkbat. ("Canderemy")
 * The Shapiro part of her last name, in Hebrew, is שפירא.
 * Isabella is a playable character in the video game version of Phineas and Ferb The Movie: Across the 2nd Dimension, which marked the first time that she is a playble character in the Phineas and Ferb video games. In this game she is playble in her regular outfit, her Resistance outfit, and her Old-Timey outfit. She is also a playable character in the World Hoverboard Tour and Isabella's Fireside Music Challenge, and the Game Smash online game, as well as the Raceway Rumble game by luck from being a multi-player online game, though that game seems to be only Phineas, despite more than one player playing the game as of October 2011. She is also seen giving advice in Transport-inators of Doooom!
 * She is clear-thinking when she is the middle of emergencies. She got everyone running for safety when Doofenshmirtz's Big Laundry experiment goes awry, saved Phineas from a fall by having the Fireside Girls bind their sashes together, and she did a water rescue and administers first aid in the biodome on Adyson. ("Swiss Family Phineas", "One Good Scare Ought to Do It!", "The Great Indoors")
 * Isabella wears an outfit and bow similar to Helga Pataki of Nickelodeon's Hey Arnold!.
 * The bow is also similar to another main Disney character: Marie the cat from The Aristocats, although Isabella's is more saturated of a pink than Marie's.
 * Also, Isabella almost never seen in her pink bow is similar to Pinch Raccoon in PB&J Otter, though Isabella is seen with many colored bows for the outfit she may have on.
 * She has no eyebrows and is sensitive about it as revealed in "Learn to Draw Phineas and Ferb". However, scenes in some episodes such as "Canderemy" and "Isabella and the Temple of Sap", accidentally include eyebrows. Also, throughout most of the episode "Happy Birthday, Isabella", Isabella can be seen with eyebrows.
 * She's usually fearless but she did get frightened during some episodes ("One Good Scare Ought to Do It!", "Get That Bigfoot Outa My Face!", "Hide and Seek", "The Lizard Whisperer", "That's the Spirit").
 * She is the second child to kiss someone on screen. The first time was when Baljeet kissed Wendy Stinglehopper. ("Phineas and Ferb Christmas Vacation!")
 * She normally wears her hair without any adjustments except for the bow, but she has the hair modified in "Jerk De Soleil" and "My Fair Goalie" as a ponytail, and in "Candace's Big Day", she has a strand of hair going down between her eyes during the line "Foot stompin'" in the song Wedding Adventure.
 * Dan Povenmire and Jeff "Swampy" Marsh are in talks of making a Phineas and Ferb spin-off that would have Isabella and the Fireside Girls as the main characters of the show. It is likely that the show will be seen first sometime in the middle or late 2014.
 * Isabella appears as a princess for the first time in "Doof Dynasty", though in another time (1542).
 * Isabella's favorite kind of cake is red velvet. ("Happy Birthday, Isabella")
 * She was mentioned in "La Candace-Cabra", but not seen.
 * According to an interview with Alyson Stoner on Magazine.ca: "Well, Isabella, to the naked eye, is the most adorable, cute and innocent, weird youngster. But, once you learn more about her, she’s actually quite capable and competent. She’s organized, she leads the Fireside girl troop, and she takes action. She has quite the crush on Phineas in the beginning, but he seems to remain oblivious and I think that’s part of the charm, his innocence towards her."
 * Before Isabella made the "What'cha doin'?" catchphrase famous, Dory from the 2003 Disney/Pixar film Finding Nemo and London Tipton from The Suite Life of Zack and Cody also have used this exact phrase.
 * Unlike Candace Flynn and Stacy Hirano, she has not wore a 1-piece and a 2-piece swimsuit in the series so far.
 * Isabella dressed up as a fairy princess for Halloween ("That's the Spirit"). She was also a fairy in "Excaliferb".
 * "The Curse of Candace" reveals she has a Bamboo plant named Bambina.
 * She knows how to scratch records for rapping. ("Take Two with Phineas and Ferb: Larry King")
 * Isabella appears to be one of the most slender Disney heroines, as her body is only about 30% of her head. Despite this, she seems to be more capable than most of them. See Skills and Abilities above for info.
 * Her prehistoric ancestor is a cave-girl named Isabelock. Unlike her, she uses the phrase "Wakka Tukka" which is caveish for "Whatcha Doin'". ("Tri-Stone Area")
 * She has had 3 speaking cameos ("Lights, Candace, Action!", "It's a Mud, Mud, Mud, Mud World", "Bullseye!") and didn't speak in 5 episodes she was in ("Mom's Birthday", "Oh, There You Are, Perry", "Moon Farm", "Delivery of Destiny"). "Moon Farm" was the first time Isabella never spoke, despite she being seen in most of the Phineas's plot.
 * In season 3, her Fireside outfit only appears in 5 episodes: "The Great Indoors", "Agent Doof", "Ferb TV", "Buford Confidential" (though it's on the newspaper), and "Phineas' Birthday Clip-O-Rama!" (though it's in a clip from "Isabella and the Temple of Sap").
 * The first Fireside Girl patch she earned was the Medival Siege Engine Patch ("Doonkleberry Imperative").
 * Isabella dances around like a prima ballerina when she was jumping on the trampolines. ("Let's Bounce")
 * She took down Mitch using only her extreme cuteness. She became the first ever Disney character to defeat a villain this way. ("Meapless in Seattle")
 * Isabella makes a cameo in one of Bleedman's popular web comic: Powerpuff Girls Doujinshi.
 * Besides speaking both Spanish and English, she can speak Ferb Latin very well and some French. ("Ferb Latin", "Buford Confidential")
 * "Bully Bromance Break Up", "Road to Danville", and "Bee Story" are three (and currently the only) episodes that Isabella appears without Candace so far, not even in a cameo.
 * Isabella is less than 11 because she said she couldn't wait until going to junior high. ("Cranius Maximus")
 * In the song, S'Winter, her singing voice is voiced by Laura Dickinson
 * Isabella is the only one of Phineas and Ferb's friends to not have a flashback showing her when she was younger yet.
 * During Season 1 and Season 2, Isabella was slight taller than Phineas. However, Season 3 onwards, they now both share the same height.
 * She gets afraid if she can't earn a patch. ("Where's Perry?", "Bee Story")
 * Similar to how Phineas says "Where's Perry?" whenever Perry leaves on a mission, Isabella says "Where's Pinky?" when Pinky leaves for a mission.

Songs Isabella has sung
Isabella has sung a number of songs in the series, with most of songs the coming in the start of season 2 onward. Also in many of those songs, she is usually heard singing at least one line by herself.
 * "Go, Go, Phineas" (with the Fireside Girls, first singing role in production order, from the episode "The Fast and the Phineas")
 * "In the Mall" (with Phineas Flynn, from the episode "The Magnificent Few")
 * "S'Winter" (With Adyson Sweetwater and Gretchen from the Fireside Girls, from the episode "S'Winter")
 * "Gitchee Gitchee Goo" (With Adyson Sweetwater, Milly, Gretchen, Phineas, Ferb, and Candace, first song sung in broadcast order, from the episode "Flop Starz")
 * "The Ballad of Badbeard" (with the Fireside Girls (except Katie), from the episode "The Ballad of Badbeard")
 * "The Flyin' Fishmonger" (with the Fireside Girls [Except Ginger Hirano] and Phineas, from the episode "The Flying Fishmonger")
 * "Let's Go Digital" (with Baljeet and Buford, from the episode "Gaming the System")
 * "Phintastic Ferbulous Car Wash" (with the Fireside Girls, Phineas, Ferb, Buford, and Baljeet, from the episode "At the Car Wash")
 * "Come Home Perry" (with the Fireside Girls, Phineas, and Candace, from the episode "Oh, There You Are, Perry")
 * "Spa Day" (with the Fireside Girls [Except for Adyson Sweetwater], from the episode "Spa Day")
 * "Fireside Girls" (with the Fireside Girls, from the episode "Isabella and the Temple of Sap")
 * "Atlantis" (With Phineas, Ferb, Buford, and Baljeet, from the episode "Atlantis")
 * "Where Did We Go Wrong?" (With Phineas and Baljeet, from the episode "Phineas and Ferb Christmas Vacation!")
 * "Danville for Niceness" (With Phineas, Baljeet, Buford, and Danville, from the episode "Phineas and Ferb Christmas Vacation!")
 * "The Yellow Sidewalk" (with the Fireside Girls (aka Patchkins), from the episode "Wizard of Odd")
 * "The Dad-inator" (own song)
 * "City of Love" (2nd own song in the album version, with Ferb in the broadcast version, from "Phineas and Ferb Summer Belongs to You!")
 * "Summer Belongs to You!" (with Phineas, Ferb, Candace, and the Fireside Girls, from the episode "Phineas and Ferb Summer Belongs to You!")
 * "The Twelve Days of Christmas" (with the Phineas and Ferb cast on the Phineas and Ferb Holiday Favorites album)
 * "We Wish You A Merry Christmas" (with the Phineas and Ferb cast on the Phineas and Ferb Holiday Favorites album, later heard in the episode "A Phineas and Ferb Family Christmas")
 * "Let it Snow, Let it Snow, Let it Snow" (3rd own song on the Phineas and Ferb Holiday Favorites album, later heard in the episode "A Phineas and Ferb Family Christmas")
 * "What'cha Doin?" (with Katie, Milly, Gretchen, and Holly, from "Rollercoaster: The Musical!")
 * "Rollercoaster" [Heard Screaming] (with the Fireside Girls, Phineas, Ferb, and Buford, from "Rollercoaster: The Musical!")
 * "Carpe Diem" (with the Phineas and Ferb cast, from the episode "Rollercoaster: The Musical!")
 * "Pinhead Pierre Theme" (sung briefly with Lawrence Fletcher and Phineas Flynn, from the episode "Magic Carpet Ride")
 * "With These Blueprints" (With Candace, Baljeet, Buford, and Heinz Doofenshmirtz, from the episode "Phineas and Ferb Interrupted")
 * "Ferb Latin" (With Phineas, Ferb, Baljeet, and Buford, from the episode "Ferb Latin")
 * "Zubada" (With With Phineas, Ferb, Baljeet, Buford, the Caveside Girls [Fireside Girls], Candace, and Jeremy, from the episode "Tri-Stone Area")
 * "Un-Untieable Knot" (With Phineas, Ferb, Baljeet, and Buford)
 * "Alone" (featuring Baljeet and Buford)
 * "Only Trying To Help" (Upcoming, episode TBA)