Heinz Doofenshmirtz

Dr. Heinz Doofenshmirtz is the main antagonist of Phineas and Ferb. He is a dimwitted scientist that vows to rule the "Tri-State Area" for the smallest or even the most ridiculous motive possible. He is the arch-nemesis of the title characters' pet, Perry the Platypus, although he is unaware of his owners' existence. He is voiced by the series's co-creator, Dan Povenmire.

Role
Heinz Doofenshmirtz is the antagonist of the animated television series Phineas and Ferb. Doofenshmirtz is voiced by Dan Povenmire and created by Povenmire and Jeff "Swampy" Marsh. Doofenshmirtz first appeared in the pilot episode of the series and since then has appeared in every episode to date except "Isabella and the Temple of Sap". A routinely bumbling, incompetent and forgetful mad scientist, Doofenshmirtz is the primary villain of the series and the mastermind behind the B-Plot.

Doofenshmirtz's goal in life is to "take over the entire tri-state area" and attempts to do so with obscure contraptions and inventions that tend to have "-inator" as the suffix (as a child, he invented a machine simply called the "Inator"). Doofenshmirtz's voice is of Eastern European descent (most likely Czech, Polish or Sorbian, as he was noted by Lawrence as having a German accent) and was a voice Povenmire used since he was a fifteen-year-old having pillow fights with his sister.

In nearly every episode of the series, Doofenshmirtz has an evil scheme or invention that he explains about through the means of a "back story" from his youth. Throughout the series, the back stories explore his mentally abusive and shunned childhood growing up in the fictional village Gimmelshtump, Druelselstein. Doofenshmirtz usually monologues and displays acts of "cartoonish" physical violence towards his frenemy Perry, a skilled anthropomorphic platypus secret agent who disguises himself as the mindless pet of the series main characters. Doofenshmirtz appears in several merchandise pieces based on the series, particularly the book series and the video games.

Creation and design
Doofenshmirtz is voiced by Phineas and Ferb co-creator Dan Povenmire. When Jeff "Swampy" Marsh and Dan Povenmire were working on the Nickelodeon animated series Rocko's Modern Life, they always had two things in episodes they worked on: a song or a musical number and an action/chase scene. When they created Phineas and Ferb, they wanted to incorporate this trait into that series too.They used a platypus secret agent to do so due to the animal's interesting appearance, and wanted to have a continuous nemesis for him that the viewers could get to know. They choose one named "Dr. Meddleshmirtz;" Meddleshmirtz was a prototype for Doofenshmirtz and carried a majority of his traits. His name eventually was changed to "Doofenshmirtz."

Every main character of the series was designed to incorporate geometric shapes in reminiscence of Tex Avery's graphic style for his Looney Tunes cartoons; Doofenshmirtz himself appearing to use that of an oval. They were as well meant to be drawn very simple, so that the child viewers could draw them easily themselves. Each one was designed to be recognizable from a distance or, as Povenmire notes as a reference to Matt Groening and The Simpson's, by silhouette.

Voice
Co-creator and executive producer Dan Povenmire voices Doofenshmirtz. He describes the voice he uses as "vaguely Eastern European" and is one he used at fifteen years old when having pillow fights and such with his five year old sister. To this day, his sister recognizes the voice and asks him to do it frequently. During recording sessions, Povenmire is easily able to ad-lib and improvise; the writers are known to change his lines around and add new ones without throwing him off. Povenmire sometimes adds his own lines to mix with the script, as well as being asked to alternate his voice to enunciate his lines. Povenmire is usually asked to perform the voice in interviews and performs the voice for his daughter's friends.

Personality
Doofenshmirtz is portrayed as an evil mad scientist who despises almost everything around him, including pelicans, ear hair and such obscure things such as musical instruments starting with the letter "B." Doofenshmirtz treats his nemesis Perry the Platypus as his best friend, and is often concerned for Perry when he does not arrive at the scene of his next scheme, hesitating to execute his plans and fearing for where Perry has gone - though he notes that he "hopes something terrible has happened to him." Doofenshmirtz's relationship with Perry has also been used to his advantage, as he once replaced Perry as his nemesis with a secret agent panda bear to cause depression in Perry, causing a distraction from his actual plot to freeze agents to use as a giant chess set. When Perry is re-assigned by the Agency to a higher-leveled threat, The Regurgitator, leaving Doofenshmirtz classified as a low-level threat who would be dealt with by a secret agent snail, Doofenshmirtz himself took up an internship with the new villain to assist him in ultimately defeating the new threat and keeping Perry as his nemesis. He is currently the 2nd fastest cup stacker in the world (only to Candace Flynn). He is also always beaten by a baking soda volcano.

Perry the Platypus
His nemesis is Perry the Platypus and it is often cited that the two enjoy loathing each other and presumably have for years. Despite this, Doofenshmirtz is unable to recognize him unless he is wearing his secret agent hat. ("It's About Time!," "Lawn Gnome Beach Party of Terror", "A Hard Day's Knight", "Attack of the 50 Foot Sister", "The Lemonade Stand")

In the words of Doofenshmirtz himself to Perry, their encounters are typically in the following format:


 * "I have a scheme."
 * "You try to stop me."
 * "I trap you."
 * "I tell you my scheme."
 * "You escape."
 * "We fight."
 * "I'm defeated."

Doofenshmirtz shouts a constantly recurring phrase, which has numerous occurrences in the series, to Perry every time he thwarts his schemes:

"Curse you, Perry the Platypus!"

Perry shows no concern at his words, considering its frequent usage, and due to the fact that its meaning is trivial: Doofenshmirtz mainly expresses his frustration and annoyance towards Perry through it, and it is generally expected and not taken seriously. The phrase is present in nearly all episodes, considering Doofenshmirtz repeats it every time Perry ruins his plans. Doofenshmirtz tends to have an evil scheme whenever he appears (the only episode when Doofenshmirtz is absent is "Isabella and the Temple of Sap") and since he never seems to succeed, (with the exception of "Phineas and Ferb's Quantum Boogaloo", where Doofenshmirtz temporarily gains control of the entire world in the alternate universe where Phineas and Ferb were 'busted' by Candace) Perry always stops him, he is shown using it often, it is seldom he doesn't. It is sometimes regarded as Doofenshmirtz's catchphrase.

Because Perry enjoys foiling Doofenshmirtz's plans, he doesn't usually turn him in to any sort of authorities. Despite this, there have been some rare occasions where Perry has not allowed a scheme to be carried out at all. This is usually if Doofenshmirtz's plan happens to put the Flynn-Fletcher household directly in danger ("Journey to the Center of Candace," et al.).

Dr. Doofenshmirtz has used many different contraptions and methods, including crocodiles, as a means of containing Perry, but his standard method is to use a cage ("The Ballad of Badbeard," "Crack That Whip," et al.).

Though Perry and Doofenshmirtz regard each other as a nemesis, their relationship is more along the basis of "friendly enemy". Doofenshmirtz habitually explains his plans before carrying them out and Perry always stops to listen. Sometimes, depending on the situation, Perry will help Doofenshmirtz with his "idea of the day" before proceeding to stop him when the situation becomes dire or when Doofenshmirtz turns his back on him. Perry also offered Doofenshmirtz his "universal delete button" to erase an embarrassing viral video that had became so well known that he couldn't walk outside his apartment room without being mocked. ("Dude, We're Getting the Band Back Together","Thaddeus and Thor","Unfair Science Fair Redux (Another Story)" "Tip of the Day") Doofenshmirtz always anticipates Perry the Platypus's entrance and even begins to become anxious if he doesn't show up ("Hail Doofania", "No More Bunny Business",). He also tends to let Perry into his own home or lair should he discover Perry's presence before Perry has the chance to break himself in. In fact, the two of them are so used to one another being in each others lives that they can't be nemeses with anyone else for more than a day or so. They even exchanged genuine Christmas presents ("Phineas and Ferb Christmas Vacation!"). Once, Perry helps him learn how to kick a ball to impress Doofenshmirtz's mother ("Thaddeus and Thor"). At one point when Perry the Platypus refused to foil his plans, he followed constantly telling him to thwart him ("Perry Lays an Egg").

Perry always saves Doofenshmirtz from death, when Dr. D created his own aluminum siding business, Perry rescues him when it is on the brink of explosion. ("The Magnificent Few") Doof doesn't usually return the favor, as he himself often puts Perry in peril, due to his evil reputation. Another example of this was in ("Spa Day") when after Doofenshmirtz tries to save Mr. Fluffypants resulting in him falling off the building Perry dives after him stopping him and Mr. Fluffypants before they fall to the ground.

At one point, Doofenshmirtz meets Peter the Panda and makes him his new nemesis, and despite his claims that it was just a spur of the moment whim, Perry is still very upset about the development. As time passed Doofenshmirtz himself found that it wasn't the same and that he missed Perry too, remembering that the day he met Perry was the best day of his life. The two of them end up going on a show called Dr. Feelbetter to sort out their feelings, and after apologizing (and turning the show into a hostage situation for Perry to foil), Perry and Dr. Doofenshmirtz are (happily) enemies again ("It's About Time!"). Similarly when Perry is assigned a new villain to thwart, Doofenshmirtz is quite offended and states that only he is Perry's nemesis ("Oh, There You Are, Perry"). In the future, when both Doofenshmirtz and Perry are old, they are shown to be living together in Doofenshmirtz's house playing checkers in place of their old routine, seemingly further emphasizing the fact they can't live without each other ("Phineas and Ferb's Quantum Boogaloo"). Doofenshmirtz even almost admitted to Perry being his best friend once ("The Chronicles of Meap").

Major Monogram
It appears that Dr. Doofenshmirtz and Major Monogram actually know each other fairly well with Doofenshmirtz knowing both his home phone and cell number ("Journey to the Center of Candace," "Don't Even Blink," "Hide and Seek").

Doofenshmirtz and Major Monogram have spoken to each other over Perry's video phone for a few brief seconds but it appears that this is not the first time the two have met ("Journey to the Center of Candace").

Doofenshmirtz has nicknamed Major Monogram "Monobrow" because of his uni-brow.("Spa Day", "Phineas and Ferb Summer Belongs to You!"). The two of them are absent in ("Isabella and the Temple of Sap").

Dr. Doofenshmirtz and Major Monogram hosted a cliptastic countdown together ("Phineas and Ferb Musical Cliptastic Countdown"). It is shown that the two appear to be quite fond of teasing and making remarks at each other that range from playful banter to being snide in nature. On the first episode of the Phineas and Ferb Podcast on iTunes, Monogram and Doofenshmirtz appear together and speak about the Christmas special with Dan Povenmire and Jeff "Swampy" Marsh.

Carl
Dr. Doofenshmirtz, as with Major Monogram, seems to know Carl well enough to give him a nickname. He probably doesn't like him because he states that he hates camera crews in My Goody Two-Shoes Brother. It has yet to be explained how two different organizations that are constantly fighting are on a nickname basis, or how Doofenshmirtz would know something as personal as Dr. Coconut, Carl's nickname because he does an odd coconut dance when he believes that no one is looking. He may have not known Carl in the episode At the Car Wash, because when he went to Carl's website, even though it had Carl's picture and name, he still called Carl "some kid."

Vanessa Doofenshmirtz
Being Doofenshmirtz's daughter, the Doctor cares for her very much, tries to think of what's best for her, and is in fact a bit overprotective of her. This is quite possibly to make up for his own miserable childhood and uncaring parents. As Vanessa grew up, Doofenshmirtz always tried to throw her great birthdays. But Vanessa's personality led to her never enjoying Doof's "little girl" parties ("Dude, We're Getting the Band Back Together"). Doofenshmirtz bought Vanessa a Mary McGuffin doll (found at the Flynn-Fletcher's garage sale) that he had "never stopped searching for," since Vanessa had asked for one when she was a little girl, though it took him 10 years to find one. This helps her to see that while he constantly did things wrong, and embarrassed her constantly, he actually was trying and really does love her. He does try to be fatherly, teach responsibility (in an evil way), and taught her how to drive. He always encourages her to be evil, but she generally doesn't seem to show much enthusiasm for "the family business." When Vanessa admitted that she was a bit evil, he cried tears of joy ("Phineas and Ferb: Summer Belongs To You!").

Roger Doofenshmirtz
Doofenshmirtz despises his younger brother, a grudge that has existed since they were children. It was Roger's fault that Heinz was forced to wear dresses for an entire year. Roger was also the obvious favorite of their mother, as while Roger would get everything, from good clothes to praise and affection, Heinz would get virtually nothing. Heinz's hatred and jealousy for his brother getting everything he wanted has caused Heinz to both attempt to ruin his brother's ceremony the day he would receive the key to the city, and try to out do him by building a new country ("Tree to Get Ready," "Gaming the System," "Hail Doofania!").

Fireside Girls
He is totally obsessed with their cupcakes and can't resist buying because they're too cute. So far the only ones seen actually selling to him are Katie, Gretchen, Milly, and Candace ("Don't Even Blink", "Fireside Girl Jamboree").

Rodney
Doofenshmirtz is rivals with Rodney because he's more evil than him. When Doofenshmirtz invited L.O.V.E.M.U.F.F.I.N., to a gathering, Rodney appeared, but Doofenshmirtz never invited him ("Nerdy Dancin'"). In the second annual inator creator contest, Doofenshmirtz defeated Rodney by destroying his inator with the Eradicate Rodney's Inator-Inator, but the Belt of Victory was destroyed in the agent fight so he was rewarded by a balloon, which he named Balloony II, probably because he still remembers about Balloony ("Robot Rodeo").

Parents
From Heinz's many stories, it's exceedingly obvious that his parents care very little for their oldest son. From making him stand still day and night as a lawn gnome, to naming the family pet Only Son, even once disowning him for a short while, forcing him to live with ocelots. Essentially they prevented him from doing things a normal kid should be able to do freely. ("Lawn Gnome Beach Party of Terror", "Got Game?", "De Plane! De Plane!", "The Chronicles of Meap")

Phineas Flynn
Phineas never happened to actually meet Doofenshmirtz; yet he caught a glimpse of Heinz while Phineas was managing the restaurant ("Chez Platypus"). He and Ferb almost ran at Doofenshmirtz when they used Perry's flying car to get into Heinz's hideout in the mountains ("Ready for the Bettys"). They were also on his track while pursuing the lost Mary McGuffin doll ("Finding Mary McGuffin"). Phineas was also one of the children Doofenshmirtz spotted while using his robot's video camera in the Flynn-Fletcher house ("Hide and Seek"). While looking for a monster truck he found Phineas and Ferb's on could see him on his inator.

Ferb Fletcher
Ferb never happened to actually meet Doofenshmirtz; yet he could catch a glimpse of Heinz while he was watching Vanessa leave the Eiffel Tower with her father and Major Monogram ("Phineas and Ferb: Summer Belongs to You"). He and Phineas almost ran at Doofenshmirtz when they used Perry's flying car to get into Heinz's hideout in the mountains ("Ready for the Bettys"). They were also on his track while pursuing the lost Mary McGuffin doll ("Finding Mary McGuffin"). Ferb was also one of the children Doofenshmirtz spotted while using his robot's video camera in the Flynn-Fletcher house ("Hide and Seek"). Ferb also caught a long glimpse of him when him and Vanessa were watching the doctor picking up the Pizzazium Infanionite ("Vanessassary Roughness").

According to the character commentary for "The Chronicles of Meap" on the A Very Perry Christmas Bonus Disc, Doofenshmirtz does not trust Ferb (he believes Ferb is a "hoodlum") and does not like the idea of Vanessa dating him.

Candace Flynn
Candace met Doofenshmirtz on several occasions. She followed Perry into Heinz's hideout and considered the doctor a pharmacist as she thought she was suffering from the hallucinogenic effects of the local moss ("The Ballad of Badbeard"). Agent P was forced to use her body to fight Doofenshmirtz once ("Does This Duckbill Make Me Look Fat?"). When they were all in space, Heinz noticed Candace whose suit hands were fattened up by the air; so Dooofenshmirtz thought she was his long-time rival, Hans ("Out to Launch"). She spotted Heinz bribing Buford so that he would be allowed to enter the restaurant and made a comment on this; yet she seemed not to recognize Heinz in any way ("Chez Platypus"). Candace finally managed to learn more about Doofenshmirtz when her older self got sent into the alternative version of the future in which Heinz was a dictator of the Tri-State Area ("Phineas and Ferb's Quantum Boogaloo"). She also delivered Fireside Girl Cupcakes to him ("Fireside Girl Jamboree").

Linda Flynn
Linda was one of Heinz's numerous dates back in the 1980s. It was she who convinced him to try taking over the Tri-State Area rather than the entire world. She did not meet him anymore after they split up ("What Do It Do?").

Lawrence Fletcher
Heinz bought the Mary McGuffin doll from Lawrence which makes the latter the only member of the Flynn-Fletcher family to actually have a regular conversaton with the modern-day Doofenshmirtz ("Finding Mary McGuffin"). Lawrence was also under a big impression of Heinz's Telethon of Evil, naming it his new favorite TV show ("The Secret of Success").

Isabella Garcia-Shapiro
Isabella was the one who showed Doofenshmirtz and his date their table to which Heinz did not bother to respond ("Chez Platypus"). She was also one of the children Doofenshmirtz spotted while using his robot's video camera in the Flynn-Fletcher house, yet Heinz did not recognize her ("Hide and Seek"). It's possible that Isabella sells cupcakes to him offscreen like the other Fireside Girls do. In a Character Commentary, Doofenshmirtz says that Isabella is full of herself, but still cute, due to her happy, postive personality and cute smile.

Buford Van Stomm
Buford was a bouncer at Chez Platypus and he accepted Doofenshmirtz's bribe so that Heinz and his date would not need a reservation ("Chez Platypus"). Buford was also one of the children Doofenshmirtz spotted while using his robot's video camera in the Flynn-Fletcher house, yet Heinz did not recognize him ("Hide and Seek").

Jeremy Johnson
Jeremy met Doofenshmirtz on one occasion, when he was giving Heinz guitar lessons. Jeremy did not bother listening to Doofenshmirtz's newest evil scheme's details as he would receive his payment anyway ("The Lizard Whisperer").

Irving
Irving was one of the children Doofenshmirtz spotted while using his robot's video camera in the Flynn-Fletcher house ("Hide and Seek").

Charlene Doofenshmirtz
Being Doofenshmirtz's ex-wife, it appears that he dislikes her, as he always refers to her as his ex-wife, and seems agitated when she's around ("Hail Doofania!"). Despite this however, they still continue to amicably share custody of their daughter Vanessa, and Charlene pays him what seems to be a very substantial alimony. The alimony is largely used to finance his projects. Vanessa often tries to "Bust" her father, telling Charlene he's evil; she replies that "just because we got divorced, that doesn't make him evil." He also puts many of his in-town purchases on Charlene's tab despite the quite obvious fact that she has no idea what he does with the things he buys ("Finding Mary McGuffin"). And although they are divorced he still gropes her for money.

Other romances
Some time in the 80's, Doofenshmirtz once dated Linda Flynn, Phineas and Ferb's mom. The date didn't go well because Doofenshmirtz among other things stuffed her in the trunk of his car going to the drive-in and laughed at her hopes of being a musician saying that he had as much chance of taking over the world. Linda replied with saying he could start with the tri-state area, which he is still trying to do.

Either before or after marrying Charlene (likely before), Heinz fell in love with a woman named Elizabeth. Elizabeth was unhealthily obsessed with whales, so he built a whale translator to impress her. Ironically, a whale convinced her to leave him ("Perry Lays an Egg").

Doofenshmirtz began dating after his divorce. The exact number of relationships he has had the event is currently unknown, although he has been shown dating four seperate women. He himself mentioned that he has had another relationship. His first known girlfriend wouldn't pick up the phone. He had a date with a second one at his Woodland House during his week off; here his internet name is shown as "StrudelCutie4427" and on the same day he mentioned another bad date that had kept stabbing him with a fork ("I, Brobot", "Get That Bigfoot Outa My Face!", "What Do It Do?").

His last date was at "Chez Platypus" and it went very well. It turned out that both he and his date were evil, but neither had known this about the other because it was not posted on their dating profiles (due to the odd people it seemed to attract). They fell in love and had a lovely montage of "evil love", but a previous plan of Doofenshmirtz's--to get rid of all the gooey love stuff in the whole Tri-State Area unless his date went well--backfired on him, even after he chose not to do it. He had gladly handed the remote to the de-love-inator to Perry, exclaiming that he did not need it any more and that he was in love. However, when Perry smashed the controls to the de-love-intator ray it caused the laser satellite in space to crash-land right next to his new-found love; It zapped her, making her unable to love. She left Doofenshmirtz stranded on a dock, her last words to him, "I feel nothing... nothing!" ("Chez Platypus") She did reappear with Doof in Rollercoaster: The Musical! for a cameo.

Mentors and Idols
Doofenshmirtz's evil mentor was Professor Destructicon. It is unknown when he became his ward, but in c. 2008, Destructicon was arrested. His last request to him was to fulfil his dream of setting fire to the sun. Heinz, however, pointed out that "it is a ball of fire, it doesn't make sense [to set fire to it]." Kevin then settled on destroying his lair. Doofenshmirtz attempted to honor his request, but failed ("One Good Scare Ought to Do It!").

All through out his evil life, he has idolized Dr. Lloyd Wexler. Having memorized his evil memoir and even doing a thesis based on Wexler's early ransom notes, Heinz still does not know him enough to tell him apart from Perry the Platypus disguised as him ("A Hard Day's Knight").

In Evil School, his professor, Dr. Gevaarlijk, hated him openly, even as Doofenshmirtz tried to be the best in the class. Gevaarlijk flunked him, though, and into his adulthood, he wrote letters to her about how his life as an Evil Scientist is doing. When Gevaarlijk finally came to his apartment to see his plans, she was deeply upset with him, and pointed out his flaws. Leaving, Doofenshmirtz was comforted by Perry the Platypus ("Oil on Candace").

Doofenshmirtz as well is a huge fan of the 90s hair band Love Händel. Since he "knew people," he somehow got them to play for him while singing about his mother's ignorance of him for his lack of kickball skills. When they performed in the Flynn-Fletcher's backyard, he danced to their song Music Makes Us Better. ("Thaddeus and Thor," "Dude, We're Getting the Band Back Together")

Reception
In a generally negative review of the series during 2008 for Toon Zone, Maxie Zeus notes that a large bright side of the series is Povenmire's performance as Doofenshmirtz. Zeus states that "Dan Povenmire voices him with such energy, and with such perfect timing, that you'll laugh out loud even at the stuff that isn't even supposed to be funny." Zeus as well says that the Doofenshmirtz subplot would have made a "fine bit of sketch writing" if trimmed down.

In 2009, Josh Jackson, editor-in-chief for Paste Magazine, wrote in a blog that Phineas and Ferb was "the best kids show on TV" and gave Doofenshmirtz a large amount of praise. He calls his inventions "awesomely designated devices of pure evil" and his complex relationship with his nemesis Perry the Platypus as "pitch-perfect."

Songs Heinz has sung
Despite Heinz Doofenshmirtz saying he is a terrible singer, he has sung a number of songs, which are listed below:
 * My Goody Two-Shoes Brother
 * He's Eviler
 * Impress My Professor
 * Hail Doofania!
 * Happy Evil Love Song
 * Charmed Life
 * My Name is Doof
 * Yodel Odel Obey Me
 * I Really Don't Hate Christmas
 * My Red Rubber Boots
 * Dodgers' Code of Conduct
 * The Dad-inator
 * Give Me Your Money Today
 * The Twelve Days of Christmas
 * We Wish You A Merry Christmas
 * Back in Gimmelshtump
 * Covered With Hair

Background Information

 * In the original story pitch, the evil doctor's name is Meddleshmirtz, which Dan Povenmire pronounces "Middleshmirtz."
 * Dr. Doofenshmirtz can speak Spanish with great knowledge, as well as Whale ("Bowl-R-Ama Drama", "Oh, There You Are, Perry," "Perry Lays an Egg").
 * Dr. Doofenshmirtz's catch phrase, "Curse you, Perry the Platypus!", is possibly a reference to the line of Emperor Zurg in Toy Story 2 and Buzz Lightyear of Star Command, "Curse you, Buzz Lightyear!" or Snoopy from Peanuts comic strips: whenever Snoopy imagines battling the Red Baron, he is always defeated and cries out, "Curse you, Red Baron!"
 * He wears a grind guard at night to keep him from grinding his teeth ("Traffic Cam Caper").
 * Despite being weak, Doofenshmirtz is very durable, as shown each time surviving certain doom (usually explosions). Also, he was once able to throw a normal cardboard party hat in to a steel pole and it made a hole and got stuck there ("Raging Bully").
 * Only four times has Doofenshmirtz escaped perfectly: In "One Good Scare Ought to Do It!" (the plan had failed however), in "Hail Doofania!," was shown in the flashback where Perry the Platypus falls down in a sandpaper factory, allowing him to escape, in "That Sinking Feeling" Perry is unable to stop him since there is no steering mechanism on the lighthouse, and in "Oh, There You Are, Perry" where he lands on the soft bed after Perry drops him. Also in the episode "Leave the Busting to Us!", he shows a chart that tells how many successful attacks he had made to Perry and vice versa.
 * He is lactose intolerant ("I Scream, You Scream").
 * He has said himself that he gets motion sickness ("Not Phineas and Ferb").
 * Like Mr. Burns from The Simpsons, he seems to have a great deal of wealth, is physically weak, and had a difficult childhood.
 * He receives a large alimony check every month.
 * He wore braces as a teenager, perhaps to solve the grinding of his teeth ("Out to Launch", "The Flying Fishmonger", "At the Car Wash", "What Do It Do?").
 * He often mangles common phrases, such as "Dos vedanya! That's two 'vedanyas'." or "As they say in China, 'Arrivederci'!". Which means that he has a "peculiar humor sense" as seen in "Spot the Diff" when he said, "I changed it from cowabunga to cowaburger" (before changing "Lawn Gnome Beach Party of Terror").
 * In "Swiss Family Phineas" one of his shoes is lost, and in the next episode ("Hide and Seek"), his shoes that he is wearing are slightly different with a small heel instead of being flat like his others, suggesting he had to purchase another pair to make up for the loss.
 * The reason he never got a doctorate, as revealed in "Oil on Candace", is because his teacher failed him out of Evil 101, his major.
 * In "Raging Bully," Dr. Doofenshmirtz states that neither of his parents showed up at his birth. However, in "Lawn Gnome Beach Party of Terror," he states that his family was a proud family, suggesting that he was always an outcast in his own family in spite of their pride. This is further evidenced in episodes such as "Thaddeus and Thor" and "Tree to Get Ready" where he claims his parents always liked his brother Roger better than him.
 * Heinz may not be able to swim, as evidenced by the water wings that appeared when he removed his lab coat in "Are You My Mummy?", and gets seasick ("Toy to the World"), possibly because his mother never let him swim in public pools ("De Plane! De Plane!"). Though when Perry toppled him in his giant washing machine he appeared to be swimming without water wings as he was in his undershirt and in boxers.("Swiss Family Phineas")
 * Heinz has an "Evil" tattoo on his left arm ("Chez Platypus").
 * At one point, his computer password was "Doofalicious." However, he may have changed it due to the fact that Perry the Platypus was able to figure it out ("Comet Kermillian").
 * He plays chess ("It's About Time!") and lied (though it was believable) about having a travelers' chess board in his bag in "Journey to the Center of Candace".
 * He uses a retainer ("At the Car Wash").
 * He holds/uses his mouse in his left hand, showing that he is most likely left handed ("Oh, There You Are, Perry", "At the Car Wash"), but kicks right-footed as seen while playing kickball in "Thaddeus and Thor". He also plays the guitar right-handed, as seen during numerous songs.
 * Given his skill with his hands, it's likely that he's ambidextrous.
 * He was the "geek" of his class and marginated because he liked magic ("Leave the Busting to Us!") like "Luismi" the character of the Spanish series "Compañeros" (1998-2002).
 * He may have to use reading glasses as seen in "Vanessassary Roughness".
 * He has been seen arrested only once, in "Vanessassary Roughness". He has to do 200 hours of community service, possibly after being caught in from that episode ("Phineas and Ferb Musical Cliptastic Countdown").
 * He hangs out with other aquatic mammals besides Perry ("Phineas and Ferb Musical Cliptastic Countdown").
 * The only episode he hasn't made an appearance on, not even a cameo, was "Isabella and the Temple of Sap".
 * He has a habit of pushing buttons ("Vanessassary Roughness", "Oh, There You Are, Perry").
 * Doof is the German word for "stupid" or "idiot".
 * He has often said "Dummkopf", a common German insult that literally translates to "stupid head". ("Finding Mary McGuffin", and "The Doof Side of the Moon")
 * Schmerz ( pronounced Shmertz) is a German word which means pain, ache, grief, or sorrow which basically describes Doofenshmirtz's childhood.
 * In the Phineas and Ferb Video game, he builds the Flat-a-Platinator to get rid of Perry the Platypus.
 * In "Crack That Whip", he says that he is unable to grow facial hair, but he is shown with a goatee in "Unfair Science Fair".
 * Dr. Doofenshmirtz can be compared to Dr. Eggman in a sense, as both are scientists and have their evil schemes thwarted by an animal character (Doofenshmirtz to Perry while Eggman to Sonic).
 * Dr. Doofenshmirtz has only interacted with Phineas and Ferb once. However, it was just a dream ("Wizard of Odd").
 * Doofenshmirtz interacts with Isabella twice ("Chez Platypus", "Wizard of Odd"). He also intreracts with Buford in the first episode mentioned and bribes him at Phineas and Ferb's restaurant, called "Chez Platypus".
 * Doofenshmirtz keeps a teddy bear in his labcoat ("A Hard Day's Knight").
 * Doofenshmirtz doesn't play and hates golf ("One Good Scare Ought to Do It!", "She's the Mayor").
 * Doofenshmirtz plans what he's going to say to Perry before hand ("No More Bunny Business").
 * If Doofenshmirtz were to be captured and arrested by the O.W.C.A., he would serve 10 to 20 years in prison ("Phineas and Ferb Summer Belongs to You!").
 * According to Dan, Doofenshmirtz has always called Perry the Platypus by his full name and never just "Perry". However he has said only "Perry" a few times in the episode "The Bully Code", where he wrote "SAVE FOR PERRY" on his cast so that Perry would have a spot to sign it. He also called Perry by the name "Perry" without the "the Platypus" suffix in "Are You My Mummy?" and twice in "Hide and Seek".
 * In one episode, he sends a humiliating video all around the Tri-State Area. But afterwards he finds out that, because of the video, he cannot go even into his kitchen! ("Tip of the Day")
 * In the made-for-TV movie, there will be an "even more evil" version of him.
 * Apparently, he has a Visigoth called Alaric working for him ("Brain Drain")
 * Doofenshmirtz is no longer welcome in Albania ("We Call it Maze").