Characters: Phineas And Ferb Youth

This is a Character Sheet for the youth of Phineas and Ferb.

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    Isabella Garcia-Shapiro 
Evidently, she and Helga Pataki go to the same clothing boutique.
"Hi Phineas. What-cha doooin'?"
Voiced by: Alyson Stoner

A girl who lives across the way from Phineas and Ferb and is a good friend of theirs. Isabella is a multi-talented member of the Fireside Girls with quite a number of accomplishment patches to her name. She has a not-so-secret crush on Phineas, and likes to pop in once an episode to ask Phineas "What'cha doin'?" and offer to help.
  • The Ace: She has an exceptionally versatile set of skills and is extremely bright and athletic. She uses these abilities to earn Fireside Girl patches - a girl scout group which presents challenges varying from extremely difficult to outright ridiculous. "Act Your Age" reveals that she becomes a resident assistant by the time she starts her first year of college and has joined numerous diverse student organizations.
  • Action Girl: Not shown that often, but comes out in spades when it does. She has defeated Mitch, trashed countless Norm Bots during the Final Battle in The Movie, and saved all of Danville from being trapped in the form of pharmacist zombies.
  • Badass Adorable: See Action Girl above. "Night of the Living Pharmacists" confirms that she knows judo, hapkido, and jiu-jitsu, though she can't use them against the titular pharmacists without coming one of them.
    • In "Meapless in Seattle", her adorableness is weaponized.
  • Beneath the Mask: She's not as innocent as she looks.
  • Berserk Button: A mild case, but she tends to get annoyed whenever someone else says her catchphrase.
    • Also, Phineas being oblivious to her feelings.
  • Beware the Nice Ones: Both one of the friendliest characters and one of the most likely to let you have it when she's angered.
  • The Big Damn Kiss: With Phineas in the movie. Then their memories are wiped.
    • Also towards the end in Phineas And Ferb Star Wars. For the first time, Phineas showed affection afterwards.
    • And the end of "Act Your Age". This is the first time where he initiates the kiss, rather than the other way around.
  • Birthday Episode: "Happy Birthday, Isabella".
  • Bitch in Sheep's Clothing: Played with, she is not a bitch in any way, but she often puts on a ridiculously ideal nice and sweet persona when around Phineas, when in reality she's a normal person with flaws and all. She does this less and less as the series progresses, growing more comfortable with being herself in front of Phineas in hopes that he'll like her for her.
  • Can Not Spit It Out: Her crush on Phineas has been a running gag from the start. Everyone Can See It, but she can't tell him how she feels. She eventually musters up the courage to tell him in "Night of the Living Pharmacists... but being zombified removes both that incident from both of their memories. Phineas only finds out for real when his other friends tell him much later on in "Act Your Age".
  • Catch Phrase: "Whatcha doin'?"
  • The Chick: The most prominent and sometimes the only female in the main group of kids, and is often the one to pep talk Phineas out of his Heroic BSODs.
  • Childhood Friend Romance: With Phineas. It took him years, but he finally reciprocated her feelings.
  • Child Prodigy: As Fireside Troop leader.
  • Color Motifs: Except in her Fireside uniform, Isabella is always seen in clothing that has purple in it.
  • Coy, Girlish Flirt Pose: Likes to greet Phineas this way.
  • Cute Bruiser: Isabella may be adorable, but she is tough.
  • Cuteness Proximity: She can inflict this on others when she makes the effort.
  • Disappeared Dad: Her father is never seen.
  • Distant Duet: With Phineas in "Act Your Age".
  • Establishing Character Moment: She gets hearts in her eyes in the first episode when she sees Phineas.
  • Expressive Accessory: In "Brain Drain" her hair bow went droopy when she was sick.
  • Foot Popping: When kissing Phineas in the movie.
  • Four-Temperament Ensemble: Phlegmatic.
  • A Girl And Her X: A Girl and Her Chihuahua. Pinky, the chihuahua, is her loving companion.
  • Girl Next Door: Literally to Phineas, she is the across-the-street neighbor.
  • Girly Bruiser: She wears a pink jumper, has a fondness for unicorns, and she's beaten Buford at sports. Considering Fireside Girls can earn a patch for wrestling an alligator, she's probably done that too. She's saved her love interest Phineas from trouble about as much as he's saved her.
  • Great Big Book of Everything: The Fireside Girls Manual.
  • Hair Decorations: Her pink hair bow.
  • Heart Symbol: When she sees Phineas in the first episode.
  • Heroes Want Redheads: Has a massive crush on the redheaded Phineas.
  • Heroic Sacrifice: When she sacrifices her memories of Perry as a secret agent so that Perry can remain Phineas and Ferb's pet in The Movie.
  • Hey, That's My Line!: Whenever someone else says her catchphrase to Phineas, she won't be too happy about it.
  • Hiccup Hijinks: In "One Good Scare Ought To Do It!". She does end up enjoying her hiccups because they get Phineas' attention.
  • I Want My Beloved to Be Happy: In "Summer Belongs To You", during Phineas' breakdown, she sacrificed her chance to have a moment alone with him so she can get him motivated again.
  • Imagine Spot: Shown in "Isabella and the Temple of Sap" and "Bee Day". They tend to involve Phineas suddenly confessing his love to her. Apparently, this happens enough that she has a name for it and the Fireside Girls know about it.
  • Improbable Weapon User: In "Brain Drain", Isabella uses her sash as a weapon in a fighting game featuring themselves to defeat Buford. She has also used a camera to vanish a boss in a video game, a unicorn-shaped kiddie ride to take out an entire group of Norm Bots, and her cuteness to defeat Mitch.
  • Informed Attractiveness: "Meapless in Seattle" suggests that she is the cutest thing in the universe, at least among the characters that we've seen.
  • Laser-Guided Amnesia: As a Heroic Sacrifice at the end of The Movie.
  • The Leader: Of the Fireside Girls Troop 46231.
  • Let's Get Dangerous: Already competent as is. When Phineas is in danger, the kids gloves come off.
  • Literally Loving Thy Neighbor: Has a huge crush on her neighbor Phineas.
  • Magic Skirt
  • Nice Girl: Isabella is one of the friendliest people in the series.
  • Oblivious to Love: Ironically became this to Phineas. He developed feelings for her in high school (by which point she had given up on him ever figuring out her feelings for him) and she was unaware of this development until he flat out told her in "Act Your Age".
  • Odd Friendship: Sometimes with Candace.
  • Off Model: The animators seem to have difficulty remembering if she should be wearing her Fireside Girl uniform in a scene or whether she's suppose to be taller than Phineas or the same height as him.
  • One of the Boys: She regularly hangs out with the boys even when not accompanied by the other Fireside Girls and has no problem with participating in any of their activities. In part, this is due to her desire to spend time with Phineas, but there is no question that she is good friends with the rest of the group as well.
  • OOC Is Serious Business: In "Night of the Living Pharmacists", she brushes Phineas aside despite him displaying great concern for her because she had discovered urgent information about the zombie pharmacists that could help the gang save Danville.
  • Pink Means Feminine: Her dress and hair bow.
  • Relationship Upgrade: With Phineas, after high school.
  • Scout Out: Member of the Fireside Girls. She and her troop have earned many a badge in helping the boys; they have mentioned that they've collected more than fifty of the 'Help Thy Neighbor' patch because of it.
  • Ship Tease: Most often with Phineas.
  • Sibling Triangle: "Quantum Boogaloo" reveals that she's going to marry one of the Flynn-Fletcher brothers. It will probably be Phineas, but Ferb seems to hint that he's keeping his options open. "Act Your Age" shows her eventually getting together with Phineas.
  • Single-Target Sexuality: Isabella never had a crush on anyone but Phineas. Except the Beak. Who turned out to be Phineas (and Ferb).
  • Single Woman Seeks Good Man: Isabella has a massive crush on Phineas.
  • The Smurfette Principle: The main girl of the Five-Man Band, and usually the only girl when Candace and the Fireside Girls aren't involved.
  • Super OCD: The concept of not earning all the Fireside Girl patches is a horrifying prospect for her.
  • Throw the Dog a Bone: While Phineas remains oblivious to her feelings throughout their childhood, she does succeed in spending time with him alone in a couple of Season 4 episodes ("Happy Birthday, Isabella" and "It's No Picnic").
  • Tomboy with a Girly Streak: Inverted. She's girly, romantic, loves unicorns and wears a pink dress. Yet she's expressed a fondness for gross things and her Fireside Girls' manual includes a lesson on car maintenance.
  • Took a Level in Badass: In Phineas And Ferb Star Wars.
  • Tsundere: Some episodes seem to indicate that she's a Type B.
  • Tuckerization: Named after Dan Povenmire's daughter.
  • Twofer Token Minority: Hispanic and Jewish. Her family is part of the "Mexician-Jewish Cultural Festival".
  • Unrequited Love Switcheroo: "Act Your Age" reveals that Isabella gave up on Phineas when they started high school, thinking that he'd never figure it out. He started developing feelings for her around the same time, though he never did figure it out — he had to be flat out told by his friends after he said to them that he was fully convinced he was in the friend-zone. In the meanwhile, Isabella remained completely unaware throughout their high school years until he finally told her as she was leaving for college.
  • Vocal Dissonance: In "It's a Mud, Mud, Mud World", she is shown to be capable of speaking in a surprisingly deep voice.
  • Vocal Evolution: Her voice in later episodes tends to be noticeably higher pitched than in her debut.
  • Will They or Won't They?: With Phineas, of course. They Do.
  • Yank the Dog's Chain: Anytime when it looks like Isabella is about to have a romantic moment with just Phineas, something happens at the last second to ruin that moment.

    Baljeet Tjinder 
You can tell he's a nerd because he is studying during summer vacation.
"I'm running out of underpants!"
Voiced by: Maulik Pancholy

A shrimpy Bollywood Nerd who's more than a little obsessed with order and studying. He's a friend of Phineas and Ferb who occasionally joins in on their daily activity, or even seeks out their advice. Occasionally, they also seek out his, usually when it comes to things like checking their math.

    Buford Van Stomm 
He's surprisingly a Nice Guy as bullies go.
"'Wall of meat,' huh? I can do that."
Voiced by: Bobby Gaylor

While introduced as the dim-witted, thuggish local bully, Buford has some surprising Hidden Depths, and he eventually becomes a member of Phineas and Ferb's circle of friends. He still exercises a slightly twisted sense of humor, and likes to hang out with Baljeet largely (but not entirely) so he has an easy target for bullying handy.
  • All Drummers Are Animals: When Phineas and Ferb form The Baljeatles, guess who plays drums?
  • Amazon Chaser: He expresses attraction to girls who act "tough" in some way (but, interestingly, never towards Isabella, despite her having such tendencies up to and including beating him at sports).
  • Animal Motifs: He dresses up in a bear suit from time to time. He is also associated with fish, considering his pet is a goldfish and he used a fish as a weapon in "Mission Marvel".
  • Animal-Themed Superbeing: He calls himself Bear Boy in "Mission Marvel".
  • Badass Normal: In "Mission Marvel", Phineas and Ferb don the Beak suit to fight the villains while Baljeet gains the powers of Hulk from an earlier mishap. Even Perry gets an upgrade by using a superhero suit that allows him to fly. Buford? He jumps into the battle with nothing but a dead fish. Even before that, he was shown to take down a giant squid with just one hit.
  • Barbaric Bully: As mentioned above, he has Hidden Depths, but otherwise fits the template to a T.
  • Berserk Button: Don't mess with his goldfish.
    • Call Buford a wimp/sensitive, and you will receive a painful wet willy.
  • Big Eater: Buford is often seen eating or craving food.
  • The Big Guy: Though he's not dumb as he seems, he still prefers to solve most problems by physical force.
  • Big Guy, Little Guy: The big to Baljeet's little.
  • Book Dumb: He doesn't like math problems.
  • Brooklyn Rage
  • Bruiser with a Soft Center: Not that you'll get him to admit it, but he does care about his friends and has expressed interest in stereotypically feminine activities like quilting.
  • The Bully: Regularly mistreats Baljeet on-screen.
  • Bully and Wimp Pairing: With Baljeet.
  • Card-Carrying Bully: His status as a bully is a self-appointed title more than anything.
  • Catchphrase: "I want the ___."
    • "Buford loves ___."
    • He also has a tendency to say "Witchcraft!" when he sees something he doesn't quite get.
    • "I am so in love with her right now."
  • Child Prodigy: Buford shows flashes of this, from quoting Voltaire in "Summer Belongs to You" to knowing King Wenceslas' background on the Christmas album.
    • He also speaks perfect French, much to Baljeet's surprise. He offhandedly says it was easy to learn due to it's similarity to Latin.
    • It appears he also strives to hide it; in the supercomputer episode, he smacks the mind-scanning screen when it displays an incredibly complex mathematical formula.
  • The Chew Toy: He becomes this from time to time in recent episodes.
  • Cowardly Lion: Whenever he's faced with something he's actually afraid of, such as giant squid or the pharmacist zombies.
  • Crazy-Prepared: If you happen to need some obscure musical instrument, he'll have it with him. He lampshades this in "My Fair Goalie".
    • This:
    Buford: Here's the velvet rope! I never leave home without my velvet rope.
    • He also, for some reason, has life-sized moulds of all his friends, which comes in handy when Candace gets accidentally turned into liquid form by one of Phineas and Ferb's inventions.
    • In "Bully Bust", he prepares for almost every possible contingency when preventing Phineas and Ferb's invention from disappearing, except for random green rays from the sky.
  • Creator Cameo: Voiced by Bobby Gaylor, one of the show's writers.
  • Cutting the Knot: Has a talent for this, such as in "Atlantis" where, when faced with a door to the underwater city covered in hieroglyphics detailing an undoubtedly complicated sequence for opening it, Buford simply punches the door open. And, of course, his infamous jellybean eating in "We Call It Maze"
    • He even explains the Trope Maker story in "Knot My Problem".
  • Deadpan Snarker: Often quick to voice his displeasure this way.
  • Disappeared Dad
  • Dumb Muscle: At least, that's what he prefers coming across as.
  • Even Bad Men Love Their Mamas: Which, we assume, is why he named his goldfish after her.
  • Four-Temperament Ensemble: Choleric.
  • Friendly Enemy: With Baljeet.
  • Friend or Idol Decision: In "Bully Bromance Breakup", he begins working with Doofenshmirtz to take over the Tri-State Area. However, upon being told he'd never get to see his friends again, Buford decides to quit and return to being a one-nerd bully.
  • Gasshole: His character on Team Improbable, Belch Man. Especially since he brings up personality power implications.
  • Genius Bruiser: He speaks perfect French. Then goes on to quote Voltaire later in the same episode.
  • Heroic Sacrifice: When he sacrifices his memories of Perry as a secret agent so that Perry can remain Phineas and Ferb's pet in The Movie. In "Night of the Living Pharmacists", he charges at the zombies as a distraction after Baljeet is zombified in order to buy time for his remaining friends.
  • Hidden Depths: Surprisingly knowledgeable and philosophical at times.
  • I Just Want to Have Friends: His only friend as a child was a gold fish.
  • Informed Attribute: Beyond his first two appearances he hasn't demonstrated any real bullying behavior, except towards Baljeet (and even then it's more a frenemy relationship).
  • Jerkass: To Baljeet
  • Jerk with a Heart of Gold: In other cases, like the Christmas special, etc. many times. Baljeet only snaps when Buford decides to use a plastic bag over a paper bag at a store.
  • Jerk with a Heart of Jerk: In the Meatloaf Festival episode.
  • Laser-Guided Amnesia: As a Heroic Sacrifice at the end of The Movie.
  • Leeroy Jenkins: This is his usual mode of operation when action is called for. He even parodies the Trope Namer in "The Klimpaloon Ultimatum".
  • Obfuscating Stupidity: Tends to backtrack when he realizes that he has deviated from his "dumb bully" persona.
  • Pet the Dog: He likes animals. The whole reason he became the local bully in the first place was to protect his goldfish. He's also befriended a flamingo-like alien and taught domesticated squirrels to dance.
  • Precocious Crush: On Candace, apparently. As evidenced by his sneaking his number into her cellphone, and being very upset when she won't abide by the Bully Code and serve him for his having saved her life.
  • Punch Clock Villain: A bully variant. In his second appearance. These days it's rare for him to be a real bully period, except towards Baljeet. Word of God confirms that his bullying tendencies are more to keep up his self-made image of being a bully rather than out of malice.
  • Pungeon Master: In "Remains of the Platypus", his main job was to unload the cheese puns.
  • Real Men Wear Pink: He's expressed the desire to float around like a woodland pixie. He didn't mean to say it out loud though. In one episode, he really gets into quilting. (In contrast, everyone else in the group found it boring.)
  • Sand In My Eyes: A variant. He claims that he is "sweating through his eyes" when he cries and on another occasion transferred his own tear to Baljeet for the sake of denial. However, question him on whether he is sweating through his eyes, and he will admit that he is crying.
  • Sensitive Guy and Manly Man: Manly Man to Baljeet's Sensitive Guy.
  • Shout-Out: His pet fish has the same name as Biff Tannen, whose ancestor shares his name with Buford.
  • Sophisticated as Hell
  • Stout Strength: The most massive of the kids and physically strong.
  • Third-Person Person: Inconsistently but yes.
  • Those Two Guys: With Baljeet.
  • Token Evil Teammate: One bully is out of place in a group of girl scouts and nice boys. Lampshaded in the Christmas Special, with Buford being the only of the kids listed as "Naughty" after the destruction of the Naughty-Inator.
  • Took a Level in Kindness
  • Unfortunate Names: His last name is Dutch for "of the stupid" according to Dan Povenmire (after removing the second "m" from Stomm).
    • His mother may at one point have counted having the name "Biff" later revealed to be short for Biffany.
  • Unscrupulous Hero: Buford may boast about being a schoolyard bully, but when Phineas and Ferb need help, he can always be counted on.
  • Vitriolic Best Buds: With Baljeet. They even have a song about this.
  • Vocal Evolution: His distinctive raspy voice hadn't yet been fully ingrained in his earliest appearances.
  • Why Did It Have to Be Snakes?: He is afraid of giant squid. He gets over it when he defeats one in combat to protect his goldfish.
  • You Kill It, You Bought It: A "beating up" variant. Became the local bully by beating up the previous one to defend his goldfish. Probably why he's an all-around better guy than bullies usually are.

    Irving Du Bois 
This is what you'll become if you love your idols a little too much.
"Phineas and Ferb rock!! Wooo!!!"
Voiced by: Jack McBrayer

A nerdy local kid who was introduced in "Hide and Seek" as an obsessive fan of Phineas and Ferb and their ambitious antics. He tags along with their daily projects on occasion in later episodes. When he's not geeking out over Phineas and Ferb, Irving can be seen butting heads with his equally geeky older brother Albert.
  • Absurd Phobia: He fears, of all things, the color lavender.
  • All There in the Script: His last name. Confirmed by Swampy Marsh on Twitter after not being mentioned in the show... yet.
  • Ambiguously Bi: He stalks Phineas and Ferb and hits on Candace and Stacy.
  • Annoying Younger Sibling: To his brother Albert.
  • Ascended Fanboy: While one could say he was this from his introductory episode, a better case would be made for his going from a largely ignored Tagalong Kid to Phineas gladly accepting his help on a project in "Doof Side of the Moon", and his friends having no problem taking his advice planning Phineas's birthday in "Phineas' Birthday Clip-O-Rama!"
  • Casanova Wannabe: He's tried his luck with Candace and most of the Fireside Girls, but interestingly, flirting with Isabella is the least likely thing he'd do.
  • Characterization Marches On: While he remains a complete Loony Fan to Phineas and Ferb, his episodes show him steadily becoming less irritating about it, and he eventually goes from a Tagalong Kid to a welcomed member of Phineas and Ferb's inner circle.
    • Adding Albert to the show also gives him something to do other than obsess over Phineas and Ferb, making him a bit more rounded.
  • Four-Temperament Ensemble: Leukine
  • Crouching Moron, Hidden Badass: It's implied that he defeats numerous Normbots on his own during the final battle in the movie, in the Beak suit's detached lower half.
  • Hero-Worshipper: Of Phineas and Ferb.
  • Hidden Depths: He only knows one song, but can perform it well enough to become a global sensation.
  • The Intern: He works as one for O.W.C.A. ten years in the future.
  • Loony Fan: Of Phineas and Ferb.
  • Lower Deck Episode: "Not Phineas and Ferb".
  • Meta Guy: He demonstrates extreme awareness of Running Gags and other aspects of the cartoon, even by the standards of the show.
  • Mission Control: He serves as this on several occasions when Phineas and Ferb have gone into space.
  • My Friends... and Zoidberg
    Phineas: Friends, bullies, Irving...
  • Non-Action Guy: In his debut, he tries to help the others fight a robot and fails epically.
  • Palantir Ploy: Has a complex network of spy cameras set up all over Danville just to capture Phineas and Ferb's exploits, and he proves it by providing footage for the clip show in "Phineas' Birthday Clip-O-Rama!". Already impressive, but some of this footage is from "Phineas and Ferb get Busted", which means that he somehow managed to set up a spy camera in Candace's dream within Perry's dream.
  • Precocious Crush: In "Moon Farm" he seems to be trying to flirt with Candace and Stacy.
  • Remember the New Guy: In his first appearance in "Hide and Seek".
    I'm mostly in the background.
  • Shipper on Deck: It's shown that the least likely thing for him to do is hit on Isabella, which is probably because he, like a lot of the show's fans, ships her with Phineas.
  • Sixth Ranger: He's becomes one for Phineas and Ferb's group.
  • Tagalong Kid: He acts like this at first. It's toned down a bit after "Atlantis".
  • The Team Wannabe: He has to actively try and join the group in his early appearances and is treated more like a tagalong. Over time he becomes a more accepted, if irregular, member.
  • This Loser Is You
  • Warts and All: Gets a brief moment of this towards Phineas in "Hide and Seek", when he finds out that Phineas relies much more on improvization than he thought. He gets over it quickly, though.

    The Fireside Girls, Troop 46321 
From left to right: Milly, Gretchen, Ginger, Holly, Katie, Adyson
Gretchen: "Would that be electronically fuel-injected?"
Holly: "It just smells like feet in here!"
Katie: "Excuse me, Phineas. Can I get you to sign some liability waivers?"
Adyson Sweetwater: "Lemme guess, the Let's Help Phineas and Ferb Patch?"
Milly: "Again, forget the idea of little people in there."
Ginger Hirano: "Why don't we ever go see what Baljeet is doing?"

Voiced by: Ariel Winter (Gretchen), Cymphonique Miller (Seasons 1 & 2)/Diamond White (Seasons 3 & 4)/Dana Davis ("Act Your Age") (Holly), Isabella Acres/Soleil McGhee ("Act Your Age") (Katie), Madison Pettis (Adyson), Isabella Murad/Dannah Phirman ("Act Your Age") (Milly), Tiffany Espensen (Seasons 1 & 2)/Michaela Zee (Seasons 3 & 4)/Ming-Na Wen ("Act Your Age") (Ginger)

A group of Isabella's friends from the local Fireside Girls troop. Whenever she helps out with one of Phineas and Ferb's schemes, they often end up getting pulled into the antics too.
  • Action Girls: They are very mechanically skilled and capable of some crazy stunts. Some of their achievement patches require very physically demanding activities.
  • Ascended Extra: Ginger has had noticeably more focus than the others starting in season 4, probably because her relationships with Stacy and Baljeet provide additional dynamics beyond simply being backup support for the title characters.
  • Badass Adorable: The Fireside Girls can earn patches for wrestling alligators and moving mountains...
  • Brainy Brunette: Gretchen.
  • Butt Monkey: Adyson gets hit hard with it in "The Great Indoors," undergoing several accidents.
    • Ginger in "Isabella and the Temple of Sap" whenever she expresses attraction to Baljeet.
  • Cannot Keep a Secret: Milly, as implied at the end of "Operation Crumb Cake".
  • Child Prodigy: Gretchen.
  • Cloudcuckoolander: Katie is shown to be this several times.
  • Crazy-Prepared: Thanks to the Fireside Girls Manual, they are ready for anything from scouting an old abandoned amusement park to repairing a time machine.
  • Deadpan Snarker: Ginger in "Bee Story".
  • Early-Bird Cameo: Ginger and Katie appear in a crowd shot in "Rollercoaster."
  • Expy: Gretchen has reddish-brown hair, wears glasses, is around nine-ish, speaks in Sesquipedalian Loquaciousness... just like another Gretchen.
    • Short. Short hair. Small eyes. Glasses. Pheebs, is that you?
  • Gadgeteer Geniuses: Most of the time they're just helping the title characters out in the background (which is impressive enough in itself), but they can also build a time machine on their own given only a blueprint (and it was a flawed blueprint too note ).
  • Girlish Pigtails: Holly and Katie.
  • Great Big Book of Everything: The Fireside Girls Manual has instructions for everything the girls need to do for the plot.
  • Green-Eyed Monster: "Act Your Age" shows that when Ginger started dating Baljeet she developed a long-standing jealousy of his childhood friend Mishti given Adyson's long-suffering admonition to "let it go" when Ginger mumbled angrily about Mishti.
  • Hair Decorations: Milly wears a yellow bow in her hair, Adyson wears a headband, and Holly and Katie have hair bands.
  • Heroic Sacrifice: When they sacrifice their memories of Perry as a secret agent so that Perry can remain Phineas and Ferb's pet in The Movie.
  • Heroines of Another Story: Shown especially in their Lower Deck Episodes.
  • Hypercompetent Sidekicks: Not only to the boys, but also to Isabella (who is herself an example of this trope). One of the most notable demonstrations of this is in "It's About Time!"
  • Inexplicably Awesome: It's only spotlighted occasionally, but they harbor a mind-bogglingly immense array of skills between them.
  • The Lancer: Gretchen in "Isabella and the Temple of Sap", Adyson in "Summer Belongs to You".
  • Laser-Guided Amnesia: As a Heroic Sacrifice at the end of The Movie.
  • Let Us Never Speak of This Again: In "Bee Story", Gretchen prevents Isabella from flashing back to the last time they failed to earn a beekeeping patch last year.
  • Lower Deck Episode: "Isabella and the Temple of Sap" and "Bee Story".
  • Magic Skirt
  • Meganekko: Gretchen.
  • Merit Badges For Everything: Not literally everything (for example, they explicitly don't have a Persistence Patch), but still an enormous number, and frequently for the most ridiculous and unthinkable achievements.
  • Noodle Incident: In "Isabella and the Temple of Sap" they hung out with Baljeet to earn a patch, with Holly saying it wasn't worth it.
    • There's also whatever happened that kept them from getting their beekeeping patches the first time.
  • Official Couple: Ginger with Baljeet, as revealed in "Act Your Age".
  • Only One Name: All except Adyson and Ginger, whose last names are Sweetwater and Hirano, respectively.
  • Puppy-Dog Eyes: Their method of getting people to buy their cupcakes.
  • The Reliable Ones: Always ready to lend a hand and can be counted on to complete any task they are assigned.
  • Scout Out: Evidently based on the Girl Scouts.
  • Sesquipedalian Loquaciousness: Gretchen, going so far as to say sesquipedalian in the show to demonstrate her prowess at it.
  • Shippers on Deck: They sometimes tease Isabella about her crush on Phineas, but are ultimately supportive of her. They are not nearly as understanding towards Ginger's attraction to Baljeet, however.
  • Shorter Means Smarter: Gretchen is the shortest of the Fireside Girls for most of the series. However, "Act Your Age" shows that she subverts this in their teen years, when she has become the tallest.
  • The Smart Girl: Gretchen. Ginger also gets to do the part in "Bee Story" thanks to a Chekhov's Lecture from Baljeet.
  • Strong Family Resemblance: Ginger looks like her older sister, Stacy.
  • Token Minority: Holly and Ginger.
  • True Companions: They stick together and work extremely well as a team. The entire group is shown to still hang out with one another even ten years later in "Act Your Age", presumably long after they have stopped being actual Fireside Girls.
  • Tuckerization: Adyson is named after Swampy's granddaughter.
  • Vocal Dissonance: In "Out to Launch", Gretchen is shown to be capable of speaking in a surprisingly deep voice.
  • What Does She See in Him?: When Ginger enthusiastically expresses interest in Baljeet, the other girls just stare at her like she said something weird.
  • Wrench Wenches: They're just as mechanically skilled as the title characters.

    Jeremy Johnson 
The man who keeps the main characters' sister in check.
"Y'know, Candace, I've had a lot of fun in your backyard, but this is the best time yet."
Voiced by: Mitchel Musso

A nice and easy-going local boy who is the object of Candace's affections. He works at the local fast-food outlet, Mr. Slushy Burger, and plays in a band, "Jeremy and the Incidentals". Later episodes expand on his originally flat characterization, giving him a bit of a snarky side when Candace is freaking out over something or another.
  • Alliterative Name: Jeremy Johnson.
  • Birthday Episode: "Cheers for Fears".
  • Boy Next Door: To Candace. A rare male example.
  • Catch Phrase: "That's my girl!" when Candace does something quintessentially Candace-like.
  • Characterization Marches On: In episode one, he was just "the guy" Candace liked, episodes afterwards made him just "the Nice Guy who cheered Candace up". After that, the show slowly chipped away at his Relationship Sue-ness, revealing things such as the fact that he is the lead singer in a band and is very dedicated to his little sister, Suzy. Now he's a Nice Guy who likes British things that is on occasion a Deadpan Snarker that messes with Candace's literal mind but still likes her just for who she is. He also, for some reason, carries a drain unclogger around.
  • Four-Temperament Ensemble: Phlegmatic.
  • Hair of Gold, Heart of Gold: Jeremy has blond hair and is a nice guy.
  • Heroes Want Redheads: He returns Candace's affections.
  • Heroic Sacrifice: When he sacrifices his memories of Perry as a secret agent so that Perry can remain Phineas and Ferb's pet in The Movie.
  • He Who Must Not Be Seen: Averted. He was originally going to be an unseen character referenced only in conversations. Mitchell Musso, meanwhile, had been cast as Ferb, but when the creators decided to make him British they wanted to retain Musso's voice, expanding on Jeremy as a result.
  • I Can't Dance: Revealed in "Nerdy Dancin'".
  • Laser-Guided Amnesia: As a Heroic Sacrifice at the end of The Movie.
  • Nice Guy: Very nice, which is lucky for Candace. Seriously, this guy's a total sweetheart
  • The Nicknamer: Though it's only come up in the episode "The Baljeatles".
  • Official Couple: With Candace.
  • Only Sane Man: Jeremy fits this trope pretty well, particularly when he is with Candace. Also, while Jeremy does get in on the show's zaniness, once in a while, one can see the "huh"-type expression on his face. Case in point:
    Phineas: So if we just find Mom, we'll find both Candaces!
    Jeremy: Uh... tell them I said hi...?
  • Pretty Boy
  • Running Gag: We never, ever get to hear a Jeremy and the Incidentals song all the way through. We either hear the first few lines only for the action to cut away, or we cut to Jeremy singing just as he's wrapping up.
  • Satellite Love Interest: A few episodes have tried to expand on his characterization, but for the most part, he doesn't seem to have any personality except "ambiguously (or not) likes Candace".
    • Later episodes avert this, giving him more personality. He's incredibly dedicated to his sister Suzy, responds to Candace's antics with some accepting amusement and snarking, and feels hurt whenever Candace thinks he would dislike her for trivial things, as she's wont to do.
  • Single-Target Sexuality: He does not seem interested in other girls, but only Candace.
  • Throw the Dog a Bone: He embodies this trope for Candace - the boys' invention will have vanished, her mom thinks she's making it up and she just looks like a fool...but then Jeremy will do something nice for her.
  • Victorious Childhood Friend: With Candace, though later than most examples.

    Stacy Hirano 
The more level-headed best friend.
"Oh, lighten up, Candy."
Voiced by: Kelly Hu

Candace's best friend since childhood. Stacy is remarkably more laid-back and unfocused than Candace, and usually tries (with little or no success) to convince her to lighten up over busting Phineas and Ferb, trying to impress Jeremy, or whatever else Candace is worrying about. She also knows about Perry's secret identity.
  • Action Girl: When the situation calls for it. She helps fight off the Norm Bot invasion in the movie. Parodied in "Phineas and Ferb Busters", when Candace makes her and Jenny go through some physically taxing exercises so they can assist her in busting Phineas and Ferb.
  • All Women Love Shoes: Stacy seems to love shoes enough to make a gelatin mold of some pumps.
  • Artistic License - Geography:
    Candace: Do you know what they have in France?
    Stacy: The pyramids?
    • And later:
    Candace: Oh, and Stacy, pyramids? Really?
    Stacy: Oh, I get it. Those are Belgium, right?
  • Ascended Extra: In the early episodes, she appeared only infrequently, if at all (she was originally just an unheard voice on the other end of Candace's cell phone conversations). As the series progressed, she appeared much more often, and has actually played a role in the plot of some episodes ("Put that Putter Away", "Elementary my Dear Stacy", "Phineas & Ferb-busters", "The Lemonade Stand"). In fact, it was almost rare to see a current episode where she doesn't appear, even if it's only for a scene or two.
  • Asian Airhead: Type II and a mild case at best. She has occasional Cloudcuckoolander tendencies and is sometimes shown to lack basic knowledge about geography, but Candace's own personal manias make Stacy the more level-headed one fairly often.
  • Attention Deficit... Ooh, Shiny!: Stacy has problems focusing on catching the boys, particularly when they're doing something she finds cool, like miniature golf. At least some of it is because she doesn't have a personal stake in busting the boys, she's just helping her friend.
  • Beta Couple: With Coltrane. However, he rarely appears.
  • Butt Monkey: In several episodes, such as "Spa Day".
  • Catch Phrase: "Would you call my mom and tell her that?" whenever Candace calls her a genius.
  • Characterization Marches On/Character Development: Stacy is starting to look like the sane girl to Candace's busting-obsession neurotic teenager and tends to be skeptical of her more insane claims. Made very clear in The Movie.
  • Childhood Friends: With Candace.
  • Cloudcuckoolander: On some occasions, such as in "Ready for the Bettys". Subverted most of the time though, with her being the more grounded one compared to Candace.
  • Cool Big Sis: Ginger views her as one.
  • Day in the Limelight: "Put That Putter Away" and (unexpectedly) "Happy Birthday, Isabella".
  • Deadpan Snarker: Towards Candace a lot.
  • Disappeared Dad: Her father never appears or mentioned.
  • Four-Temperament Ensemble: Sanguine
  • Hair Decorations: Her blue hair bow.
  • Handy Feet: She was apparently able to clean her whole bedroom with her feet, though we never saw it.
  • Heroic Sacrifice: When she sacrifices her memories of Perry as a secret agent so that Perry can remain Phineas and Ferb's pet in The Movie.
  • Informed Ability: According to her Top Trumps playing card, she's into figure skating, despite never showing this trait in the show. Then again, the canonicity of this is questionable, though they got everything else about her right.
    • Though if you look closely, she does have gold medals hanging on her bedroom wall.
    • Also in "Out to Launch" you can see a pair of ice skates hanging on the end of her bed.
  • Laser-Guided Amnesia: As a Heroic Sacrifice at the end of The Movie. And then averted in "Happy Birthday, Isabella".
  • Not So Above It All: She will sometimes go along with Candace's Zany Schemes, even right after pointing out their flaws.
  • Obfuscating Stupidity: In "Canderemy", Doofenshmirtz's latest creation has Candace and Jeremy (the latter sleeping) joined at the hip after Candace has promised Stacy not to so much as mention Jeremy for the entire day. Candace spends the entire day hiding Jeremy in more and more wildly improbable places so Stacy doesn't catch on and get angry. Eventually, the situation is resolved and Stacy says the following:
    Stacy: By the way, the best part was when you used him as a table.
  • Official Couple: With Coltrane.
  • Only Sane Woman: Especially when compared to Candace.
  • Secret Keeper: At the end of "Happy Birthday, Isabella", Stacy learns that Perry is a secret agent. She promises to keep this secret, and Perry agrees not to wipe her memory.
    • As of "Druselsteinoween" she's now assisting Vanessa in keeping her relationship with Monty secret from Major Monogram.
  • Spell My Name with an "S": Her name is sometimes misspelled "Stacey", but that's actually the masculine variant of the name.
  • Straight Man: Becomes this to Candace over time, as Candace's neurotic tendencies become more and more apparent.
  • Strong Family Resemblance: All of her female relatives in Tokyo look like clones of her.
    • Also, her little sister.
  • Token Minority: She is Japanese.
  • The Unfavorite: In "One Good Turn" it's revealed she is this compared to Ginger.
  • Unfazed Everyman: Even Perry and Doofenshmirtz crashing a truck straight into her home and proceeding to fight all over the living room doesn't faze her nearly as much as one might expect.
  • Zettai Ryouiki: Switches between Grades C and B.

    Carl Karl 
"Sorry about that, sir."
Voiced by: Tyler Mann

Major Monogram's assistant, a nerdy college intern working for O.W.C.A. who occasionally banters back and forth with Monogram while Perry the Platypus is being sent out on a mission.
  • Action Survivor: In "Save Summer", he helps Perry and Monty sneak into the headquarters of LOVEMUFFIN but is noticeably (and understandably) less involved in the action than they are.
  • Adorkable
  • Alliterative Name
  • Awesomeness by Analysis: Which makes him quite a competent threat after being turned evil. He was able to infer Perry's whereabouts correctly by identifying an obscure flower he saw in the background while video-calling Perry.
  • Butt Monkey: In the sense that he is frequently berated and ignored, often unfairly.
  • The Cassandra: On the rare occasions where he acts as the voice of reason to Monogram, he is almost always unacknowledged or entirely ignored. And on one occasion ("Undercover Carl") where Monogram does take heed, he turns out to be wrong.
  • Crazy-Prepared: He built robotic duplicates of the Flynn-Fletcher family in case one of them gets their memories erased. Major Monogram is a bit freaked out.
  • Dangerously Genre Savvy: After he's turned evil.
  • Distaff Counterpart: Carla, who is implied a relative of his.
  • Ditzy Genius: Not to the same extent as Doofenshmirtz, but he does blunder often and spends a lot of time goofing off with Monogram. Yet his intelligence makes him one of the most competent villains in the entire series when he is turned evil.
  • Dude, Where's My Respect?: "Where's Perry" explores this heavily, with this being his main motivation after being turned evil. Monogram finally grants him some respect at the end of the episode. Also comes up in "Thanks But No Thanks", in which he points out that Monogram has never thanked him for all the work he does at the agency.
  • Four-Temperament Ensemble: Leukine
  • Furry Fandom: On at least one occasion he is shown dressing up in a full-body costume to attend "SquirrelCon."
  • Gadgeteer Genius: Not shown very often, but he did create functional robot duplicates of the Flynn-Fletcher family (and then some).
  • Hidden Depths: When Carl finally gets a song of his own in "Where's Perry?", Monogram admits that he's a good singer, despite it being his villain song.
  • The Intern: Works as one in the O.W.C.A.
  • Latex Perfection: His standard disguise as a black, female clerk is pretty convincing.
  • Lower Deck Episode: "Undercover Carl".
  • Mecha Mooks: Uses these when he is turned evil.
  • Mission Control: Rarely, but he gives Perry his missions when Monogram is unavailable.
  • Mundane Made Awesome: His theme song makes all the mundane jobs he does sound awesome.
  • Nerd
  • Non-Action Guy: Despite working at an agency that employs Badass secret agents, his job is to complete menial tasks like working the camera and fixing paper jams. He does manage to subvert this a little in "Where's Perry", but still mostly relies on his Mecha-Mooks.
  • Non-Promotion: Is given the title "Paid Intern" in "Where's Perry?", but it's just a title and doesn't actually grant him any pay. He's still happy about it.
  • Not-So-Harmless Villain: Carl is a bit of a wimp, but when he turns evil in Evil For Extra Credit, he is shockingly competent and dangerous.
  • Repetitive Name: The end credits initially misspelled his name with a K, which was then explained away as his last name.
  • Secret Keeper: For Monty and Vanessa's relationship.
  • Spell My Name with an "S": The character's first name is officially spelled Carl on the show, despite the ends credits spelling it with a K. Perhaps due to this, "Ain't No Kiddie Ride"'s credits lists him as Carl Karl.
  • Temporarily a Villain: In "Where's Perry?" when he is hit with the Ultimate Evil-Inator and turns evil.
  • Those Two Guys: With Major Monogram.
  • Villain Song: "Evil for Extra Credit", when he's turned evil by one of Doofenshmirtz's -inators in "Where's Perry?".
  • "Well Done, Son!" Guy: Carl would like to have been Monogram's son and he does everything to please him.
  • Would Hurt a Child: When turned evil, he lures Perry out of hiding by putting Phineas, Ferb, and their friends in danger.
  • You Are in Command Now: Temporarily in "Save Summer" when Monogram is fired. He is rather overwhelmed by the new responsibility.
    • Ten years later in the future, he becomes an O.W.C.A. Commander for real, and appears to be handling things well enough.

    Vanessa Doofenshmirtz 
"Yeah, whatever."
"I so should've gone to summer school."
Voiced by: Olivia Olson

Dr. Doofenshmirtz's teenage daughter. When she's not being embarrassed by her father's bungling attempts at being evil, she's being embarrassed by his attempts at doting on her. Despite all that, she does love him.
  • Action Girl: Just watch "Vanessassary Roughness" where it shows what she's capable of when motivated. Her "I Am" Song "I'm Me" from that episode showcases her in action.
  • Aloof Dark-Haired Girl: Tall? Aloof and composed? Dark haired? She's three for three.
  • Always V Sexy
  • Birthday Episode: The B-plot of "Dude, We're Getting the Band Back Together".
  • Bratty Teenage Daughter: Vanessa has her moments.
  • The Cassandra: When she tries to tell her mom that Dr. Doofenshmirtz is evil.
  • Characterization Marches On: After only two episodes of showcasing it, the above-mentioned The Cassandra quality seems to have been dropped from her character, perhaps to serve as a parallel to Candace since those episodes were a reversal of the show's usual formula.
  • Daddy's Girl: Their father-daughter relationship is somewhat strained, Doof being an incredibly embarrassing Overprotective Dad who's divorced from Vanessa's mom, but she clearly cares a whole lot about him.
    • Doofenshmirtz goes to crazy lengths to make his daughter happy, even if he's wrong about what would make her happy. The one slam dunk he made was finding a Mary MacGuffin doll for years after Vanessa had given up looking for one and she was so happy she sang a song about how he's "Not so bad a dad after all."
  • Daddy's Little Villain: Slightly subverted, and by slightly subverted I mean, completely subverted! Sometimes...
    • "Finding Mary McGuffin" does have her do something nasty, though.
    • As does "Summer Belongs To You" where she "rents" a scooter and later holds up Major Monogram and Perry to rescue her father.
    • She is Daddy's Little Villain, what with her stealing her father's Catchphrase when she's carried off by her father's Pick'emUp-Inator in "Candace Disconnected".
    • In "What'd I Miss", she acts as his henchman. Granted, all she had to do was hand him a ray gun, and then she could go back to relaxing on the beach (and it probably helped that Doof had to execute his plan on the beach in the first place). But it's still interesting to notice that she didn't seem to mind. Not even one snarky remark!
  • Dark Action Girl: Depending on the episode.
  • Darker and Edgier: While not quite Candace's Evil Counterpart, in "Busted", "Finding Mary McGuffin" and "Hail Doofainia", she comes across as this in relation to Candace, even in their respective relationships with their fathers, sometimes.
  • Dating Catwoman: With Monty Monogram.
  • A Day in the Limelight: "Vanessassary Roughness".
  • Deadpan Snarker: "I should have gone to summer camp!".
  • The Dragon: To her dad sometimes.
  • Dude Magnet: Several guys in the show attempted to hit on Vanessa. Ferb has an obvious Precocious Crush on her, Jhonny was her boyfriend (in “Dude, We're Getting the Band Back Together” and “Brain Drain”) and after she dated Monty, Monogram's son.
  • Evil Counterpart: Vanessa isn't evil but in the song "Busted" and in the episodes "Finding Mary McGuffin" and "Hail Doofania" she does come across as a Darker and Edgier counterpart to Candace.
    • Interestingly enough, she's curvier than the more angular and sharp-edged Candace as their Clothing Switch in "Hail Doofania" made incredibly obvious.
  • Forehead of Doom
  • Four-Temperament Ensemble: Melancholic
  • Freaky Fashion, Mild Mind: She wears a Goth style and has a bit of a sarcastic streak, but she can be quite friendly to others, as shown in "Summer Belongs To You."
  • Goth: People keep referring to her (or more often her look) as a goth, but she refers to her clique as being punks.
  • Green-Skinned Space Babe: Takes on the role of a Twi'lek lounge singer at the Mos Eisley Cantina in the Star Wars special.
  • Hypocritical Heartwarming: While she hardly respects her father that much, she won't stand for Monty insulting him.
  • Impossible Hourglass Figure: See Ms. Fanservice below.
  • The Intern: At the end of summer, she gets an internship at the O.W.C.A.
  • Kick the Dog: As mentioned above, in "Finding Mary McGuffin" when, at near the end of the episode, Candance and Vanessa began fighting over the Mary McGuffin doll. It flies into the hands off a little girl and both look at it for a moment, seeing how much she liked it. Candace decided to let it go, Vanessa just took it.
    Doofenshmirtz: So you just took it from a little girl and left her there crying? Wow, that is evil. Honey, I'm so proud of you! It felt good, didn't it? Yeah, we can build on this.
  • Mad Scientist's Beautiful Daughter: She plays with this trope in different ways. In early episodes she was outright disdainful towards her father and his experiments, generally playing the role of Deadpan Snarker. She warmed up to him in later episodes, though she remains somewhat annoyed by his exploits and his attempts to make her into a Daddy's Little Villain (though some of her actions hint she may head down that path anyway). She's also notably uncloistered (she only spends alternate weekends with her father anyway) and keeps her relationship with his nemesis friendly but strictly platonic.
    • Played Straighter in recent episodes, when she has developed an interest in Major Monogram's son, (human) secret agent Monty Monogram. However, their first date actually devolved into a fight when Monty made a comment about her father, so the betrayal part probably isn't going to happen.
  • Morality Pet: To her dad Doofenshmirtz.
  • Ms. Fanservice: She's the only female non-adult character in the show with serious curves and her outfit hugs them tightly. And speaking of "I'm Me" up above check out the hip action.
  • Non-Standard Character Design: She's literally the only high school age character on the show to have a "womanly" kind of body.
  • Odd Friendship: Sometimes with Candace.
  • Official Couple: Revealed in 'Brain Drain' that she's going out with Johnny, then subverted in "Minor Monogram" when she breaks up with him and develops an interest in Monty. Word of God says she'll probably get together with Ferb one day when they're older, though.
    • It seems she's been dating Ferb for a while in "Act Your Age".
  • Out of Focus: Not as much in regular episodes, but she doesn't appear at all in the Christmas special, "Mission Marvel", and "Save Summer" and has a fairly minor role in "Phineas and Ferb Star Wars". She also doesn't make an appearance in the movie, though she and her alternate universe counterpart were originally planned to have each had a brief scene.
  • Perky Goth: ...whenever her dad's not around to embarrass her.
    • Actually addressed in one episode, where Vanessa informed her father that she and her friends were "Punks, not Goths." Although he'd actually been further off than that and thought it had something to do with Visigoths.
  • Perpetual Frowner: To the point where Doofenshmirtz thinks there's something wrong when he sees her smiling in "My Sweet Ride".
  • Pet the Dog: In "A Real Boy", she gives her MP3 to Norm at the end to cheer him up, and humors him in his statement of her being his "sister".
  • Precocious Crush: She's the object of Ferb's.
  • Show Some Leg: Her Vampire Queen costume.
  • Sir Not-Appearing-in-This-Trailer: A movie variant. She and her second dimension counterpart were going to appear in the movie, but were cut.
  • The Southpaw
  • Statuesque Stunner: Vanessa is the same height as Candace, 5'8.
  • Tall, Dark and Snarky: Tall? Check. Snarker? Check. Dark? Check.
  • The Ugly Guy's Hot Daughter: To her dad Doof.
  • Wacky Parent, Serious Child: She is very mature compared at her Mad Scientist dad, Dr. Doofenshmirz.
  • Woman in Black: Always dresses in black.
  • Why Couldn't You Be Different?: Zig-Zagged in 'A Real Boy', Doofenshmirtz accidentally lets slip to her that he would have preferred having a son but reversed via Exact Eaves Dropping, as Doofenshmirtz was deriding his rival, Rodney, for such notions. Finally averted altogether as Vanessa was wearing headphones and couldn't hear a word Doof was saying to begin with.

    Suzy Johnson 
This is a Face of Evil, which you must conquer.
"I am, and always will be Jeremy's favorite girl!"
Voiced by: Kari Wahlgren

Jeremy's little sister. Despite her cutesy demeanor, she's quite manipulative, and fiercely jealous of any girl trying to get Jeremy's attention.
  • Beneath the Mask: She pretends to be a dumb innocent girl, but in reality she is very smart, and cruel to whoever threatens her relationship with Jeremy.
  • Big Brother Attraction: Although it lacks any sexual qualities, she still wants Jeremy all to herself. And it's still very creepy.
  • Blondes Are Evil: Has blonde hair and is evil in contrast with his brother that is a blonde Nice Guy.
  • Child Prodigy: Far more knowledgeable and articulate than her age would suggest, though she hides this from most people.
  • Clingy Jealous Girl: To Jeremy.
  • Creepy Child: Though only Candace and Buford recognize her as one.
  • Deliberately Cute Child: She acts sweet and innocent in the eyes of her brother, but when she crosses paths with his girlfriend, Candace, she shows her True Colors when Jeremy isn't looking.
  • Devil in Plain Sight: Candace and Buford are the only aware that she is evil.
  • Enemy Mine: Sort of, Candace once has to babysit her and the two of them wind up teaming up to try and get Phineas and Ferb to bust themselves.
  • Enfant Terrible: Is apparently the most horrible thing in the world to Buford, the local bully, who all the other kids fear.
  • Four-Temperament Ensemble: Choleric.
  • A Girl And Her X: Parodied with "That's The Norm" in the episode "Ferb TV"
  • Karma Houdini: In her earlier appearances she never received any comeuppance for tormenting Candace, but subverted in "Comet Kermillian" and several episodes in Season 3 by having several of her schemes backfire on her.
  • Manipulative Bitch: She loves to manipulate people, from Candace to Jeremy to (alongside Candace) Phineas and Ferb.
    • "Suddenly Suzy" seems to indicate that she believes all sisters should be this toward their brothers, given how appalled she acts upon finding out that Candace is not.
  • Obfuscating Stupidity: Part of her acting.
  • Ping-Pong Naïveté: In most of the episodes which feature her, she's frighteningly intelligent, manipulative, and (in a way) mature. Then, in Nerds of a Feather, she gets frightened by an Alien-esque exhibit and seeks a hug from a cuddly costumed character from her favorite cartoon. This could be an attempt to uphold to the the show's proclamation of "no mean characters" by reminding us she's still a child.
  • Punch Clock Villain: When Suzy doesn't have the opportunity to embarrass Candace in front of Jeremy, she's acting civil towards her. She even uses the phrase "I'm off the clock".
  • Yandere: Take that Big Brother Attraction and make it creepy and you have Suzy in a nut shell.

    Monty Monogram 
The unibrow just works on him.
"I hope to follow in my father's footsteps and join you in the battle against evil."
Voiced by: Seth Green

Major Monogram's son who recently graduated from the High School Without A Cool Acronym, and now wants to fight evil like his father.

    Albert Du Bois 
"They call me... the Truth Detector!"
Voiced by: Diedrich Bader

Irving's older brother, with whom he often butts heads.


    Jenny Brown 
She loves world peace, dogs, and pigeons.
"Save the pigeons!"
Voiced by: Alyson Stoner

A hippy-dippy friend of Candace's who shows up on occasion. Word of God has said that she is Django's sister. Like Django, she has suffered from being Out of Focus on the show.
  • Action Girl: Parodied in "Phineas and Ferb Busters", when Candace makes her and Stacy go through some physically taxing exercises so they can assist her in busting Phineas and Ferb. In a straighter example, she helps fight off the Norm Bot invasion in the movie.
  • Demoted to Extra: After Season 1, Jenny rarely appears on the show and just as an extra.
  • Flat Character: Besides her being a Granola Girl, we not know more about her.
  • Flower in Her Hair: Jenny has long, brown hair which is decorated by a white daisy.
  • Four-Temperament Ensemble: Melancholic
  • Granola Girl: With a history of participating in various protests along with an inherent desire for world peace, she can be characterized by her hippie-like nature.
  • Missing Mom
  • Rapunzel Hair: Probably comes with being a hippie.
  • Soapbox Sadie: Has a history of participating in various protests.
  • Tuckerization: Named after Swampy's daughter.
  • The Voiceless: Hasn't spoken since season 2. Likely because of the policy that voice actors must be paid more once a show reaches season 3 and they don't want to pay Alyson Stoner for two roles.

    Django Brown 
Kids, Don't Try This at Home! He's a professional and also a cartoon character.
"I made this for my Dad, but it hardly compares to his stuff."
Voiced by: Alec Holden (Season 1), Alex Garrett (Season 4)

A friend of Phineas and Ferb's. His father is an installation artist, and some of his father's love of the arts seems to have rubbed off on him. Other than that, there's not much to say about him, which is probably why he's not seen much in later episodes.
  • Chuck Cunningham Syndrome: Django was featured prominently in four early episodes, and was even a member of Phineas and Ferb's close-knit group of friends. After "Oil on Candace" he disappeared from the main cast, and has been seen only in a handful of non-speaking cameos.
  • Day in the Limelight: "Oil on Candace".
  • Demoted to Extra: Originally appeared in 2 episodes as one of the boys' friends, now generally absent.
  • It Runs in the Family: His artistic talent.
  • Missing Mom
  • Rubber Man: Averted in "Jerk De Soleil", where he claims to able to put his foot behind his head.
  • Tuckerization: Named after Swampy's son.
  • "Well Done, Son!" Guy: Wants to create a giant work of art to impress his father. Unfortunately, when Phineas and Ferb help him make one, it washes away before his father can see it. However, his father does see his regular-sized artwork and is more than appreciative of it.

    Mandy, Thaddeus, and Thor 
Meeting the neighbors.
Mandy: "In terms of obnoxiousness, I'm sure my brothers have your brothers beat."
Thaddeus: "Well, Thor, I know who we're gonna outdo today!"

Voiced by: Aliki Theofilopoulos (Mandy), Danny Cooksey (Thaddeus)

Niece and nephews of the Ferb-Fletchers' next-door neighbor Mrs. Weaver.
  • Annoying Younger Sibling: Like Candace, Mandy considers her brothers' projects to be annoying. Unlike Phineas and Ferb, however, Thaddeus and Thor really are Jerkasses.
  • Child Prodigies: Nowhere near Phineas and Ferb's level, but Thaddeus and Thor still have above-average construction skills.
  • Creator Cameo: Mandy is voiced by storyboarder Aliki Theofilopoulos.
  • Evil Counterpart: While Thaddeus and Thor aren't evil per se, they're certainly bigger Jerkasses, a sharp against Phineas and Ferb.
  • Gadgeteer Geniuses: Not as much as Phineas and Ferb, but enough to qualify.
  • Gag Nose: Thaddeus has the same head shape as Phineas.
  • I Think You Broke Him: Mandy says "I think you broke their brains!" when Thaddeus and Thor are stunned stupid by Phineas and Ferb's fort.
  • Jerkass: Thaddeus behaves condescendingly to everyone he speaks to.
  • The Quiet One: We never hear Thor speak.
  • The Rivals: Set up as these for the Flynn-Fletcher kids in their debut. However, Phineas and Ferb do not reciprocate, only competing with their counterparts after being requested to do so by Candace. On Candace and Mandy's side of things, Mandy admits that Phineas and Ferb are more skilled than her brothers after seeing what they are capable of, and her subsequent interactions with Candace have been friendly.
  • The Silent Bob: Fittingly for Ferb's Evil Counterpart, Thor has not said a word on screen.
  • Silent Partner: Thor.
  • Small Name, Big Ego: Thaddeus and Thor's inventions don't hold a candle to Phineas and Ferb's, but you wouldn't know that by looking at their ego. The main problem seems to be that they can only achieve possible things, while P&F have no such constraints.
  • Villainous BSOD: Upon seeing Phineas and Ferb's fort.