Ferb Fletcher (2nd Dimension)

Ferb Fletcher is a boy in the Flynn-Fletcher family, the step-brother to Phineas and Candace, and the 2nd Dimension counterpart of Ferb Fletcher. Stuck in an area which is ruled by Heinz Doofenshmirtz, he has grown up without summer vacation and has never heard of it.

Early life
Ferb's early years were presumably the same as his 1st Dimension counterpart: his father Lawrence met Linda Flynn and fell in love with her, eventually marrying her, and he gained Linda's children Phineas and Candace as step-siblings. At least five years ago prior to Across the 2nd Dimension, he and Phineas bought Perry, who apparently was a secret agent (it is never brought up). Somehow, Perry was defeated and captured by Dr. Doofenshmirtz without Ferb's knowledge, resulting in his transformation into the Platyborg, which commanded an army of Norm bots to the invade The Tri-State Area and conquer it. Now forced to live under Doofenshmirtz's tyrannical reign, Ferb spent the recent years playing Doofopoly with Phineas while wearing his Dooferalls. At some point, Candace founded The Resistance, an organization bent on overthrowing Doofenshmirtz, but forbade Ferb or Phineas from joining it out of concern for their safety.

Present life
Ferb and Phineas meet their 1st Dimension selves while playing Doofopoly, and he and Ferb-1 exchange handkerchiefs while watching Phineas hug Perry-1 under the impression that he is their Perry. After Perry-1 departs, the four go to Isabella's house; during the walk, they are saved by Buford from a patrolling Norm bot. The five then arrive at the Resistance headquarters via chute, and he and Phineas, along with Phineas-1 and Ferb-1, find out that Candace is the leader of the Resistance.

Candace agrees to aid Phineas-1, Ferb-1, and a recently-arrived Candace-1 in rescuing Perry-1, who was captured by Doofenshmirtz. However, he and Phineas are told to stay behind; despite this, they stow away in mine carts used by the Resistance. When Perry is rescued and an army of Norm bots pursues them as a result, Candace is forced to separate their mine cart from that of the 1st Dimension characters' to save her brothers from certain capture.

After managing to become a Resistance member along with Phineas, Ferb aids Jeremy in his mission to rescue a captured Candace. She initially disapproves of her brothers' decisions, but after realizing that they can handle themselves in the outside world, she changes her opinions and shares a hug with the two of them.

Ferb is later amongst the Resistance members that travel to the 1st Dimension to congratulate the residents in defeating Doofenshmirtz. He and Phineas share a loving reunion with Perry, whose evil was "fried out of him" after a battle with Perry-1 ("Phineas and Ferb The Movie: Across the 2nd Dimension").

Personality
Like his 1st Dimension counterpart, Ferb is intelligent but he rarely speaks. Other than that, little of his personality is revealed in the movie, although he most likely wants to join The Resistance in their mission to bring down Doofenshmirtz as much as Phineas does.

Physical Appearance
Ferb is physically identical to his 1st Dimension counterpart, with the exception that he is paler, has his hair cut military-style, and wears a white shirt and Dooferalls. As a Resistance member, he wears a black shirt, black pants, black boots, an Army-green jacket, black gloves, and black sunglasses.

Phineas Flynn
He, like his 1st Dimension counterpart, not only sees Phineas as a stepbrother, but as a best friend. They would presumably spend all day playing Doofopoly.

Candace Flynn
He hasn't been seen speaking directly to Candace, but it appears that he loves her as a sister just as Phineas loves her.

Perry the Platypus
He hasn't been seen showing any emotion towards the subject of Perry, but he undoubtedly worries about his pet platypus' disappearance as much as Phineas does.

Background Information

 * Website Summary:
 * A boy of few words, Ferb likes to keep to himself and out of trouble. He doesn't leave the house much due to the patrolling Norm bots and his his mother's instruction that talking to the neighbors is dangerous.
 * He is presumed to have built a rollercoaster with Phineas after the events of the video game, as a tie-in to the show's pilot episode.
 * Unlike his 1st Dimension counterpart, he never met Vanessa Doofenshmirtz-2.
 * He only speaks one short line in the entire film, during the lyrics of Summer (Where Do We Begin?), compared to his 1st Dimension counterpart, who speaks a few more lines.
 * He apparently learned classical guitar off-screen.