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Adam M. Lyon
Voiced by: Nika FuttermanA human boy who was transferred from Chester Arthur Middle School to Charles Darwin Middle School by an accidental misspelling of his last name from "Lyon" to "Lion".
- Adam and/or Eve: It can be perceived that Adam, being the first human male in an all-animal environment is a biblical reference.
- Berserk Button: After dealing with repeated torture from Jake, Pixiefrog, or CDMS in general, Adam will often lose his mind in the climax or ending of a few episodes.
- Body Horror: At the end of "Hyena and the Mighty", Adam gets beat up by random machines after threatening Rufus to stop crying and Adam's beating makes Rufus laugh and results in Adam getting injured and bruised. But he deserved it for the massive jerk he was being.
- Butt-Monkey: He constantly gets in trouble for Jake's misbehavior, gets hurt a lot, has bad luck, etc.
- The Bore: He became this in "Wild Thing", where his friends, teachers, and even bullies would be driven mad by his long, drawn out tangents about his personal life, internal struggles, backstories, etc.
- Character Development: He's not only grown more accustomed to his animal school, but he's embraced it. In late season 3 and season 4, there are also episodes, where he stops playing the straight man and acts just as goofy as Jake and Slips, if the episode were to focus on the problems happening with another character, such as Windsor or Ingrid.
- Characterization Marches On: However, that didn't stop him from having Aesop amnesia in a few later episodes, with him once again, babbling on and on about how he's the only human and he misses his old school, blah blah blah.
- The Chew Toy: Most of his haplessness is played for comedy.
- Chick Magnet: He became this in "I Got Rhythm". Also in "The Frog Principal", but only because of a love potion.
- Collector of the Strange: Collects weird Captain Clowny merchandise and takes it to extremes. He even has a Captain Clowny grandfather clock in his room, which he uses as his regular alarm.
- Deadpan Snarker: Pays to be this if you're the Only Sane Man of this school.
- Did Not Get the Girl: Endings to plots with Kerry consistently zig-zag from this, to the opposite.
- Face Palm: Tends to do the forehead slap a lot.
- Failure Hero: Most of the time.
- Fiery Redhead: ... You could call it that ...
- Goofy Print Underwear: Adam has underwear with a picture of Captain Clowny's face in the butt, with a real red nose, that actually honks, when squished.
- The Hero: The closest this show has to one.
- Jerkass Ball: "The Hyena And The Mighty".
- Jumping Off the Slippery Slope: "The Hyena And The Mighty"; his abuse of Rufus Hyena. Particularly the scene where he threatens the hyena with physical violence to stop crying.
- Kick the Son of a Bitch: See Body Horror above.
- Love Makes You Dumb: Adam can do a lot of stupid things, just to impress Kerry.
- Meaningful Name: His first name is a biblical reference. Adam from the bible was the first human man, placed on a planet with it's only other inhabitants being animals. Meanwhile, Adam from the show is the first human boy, sent to a school, with it's only other students being animals.
- The Napoleon: He's in middle school and is short and stout.
- Only Sane Man: Literally, and figuratively.
- Real Men Wear Pink: He can be rather effeminate at times and has been noted to have a rather girly voice.
- Red Heads Are Uncool: Though, the fact that he's a ginger usually has nothing to do with his loserdom, it is a running gag for people to poke fun at his hair color.
- Sensitive Guy and Manly Man: Sensitive Guy to Jake's Manly Man.
- Stranger in a Strange School: A human boy accidentally sent to an animal school.
- Token Human: The only human of Charles Darwin Middle School.
- Wanting Is Better Than Having: He had this in one episode when he temporarily went back to his old school, finding Charles Darwin Middle School to be more fun and interesting in comparison.
- Youthful Freckles: Because he has red hair.
Jacob "Jake" P. Spidermonkey
- Ambiguously Gay: Jake appears to like Adam as a bit more than just his best friend. He is shown to be excited when he gets rainbows on his report card, plus he's obsessed with his own butt.
- Animal Stereotypes: Oh look, the monkey character is hyperactive and nutty.
- Dirty Coward: Whenever Adam is even remotely involved in one of his destructive antics, he tries placing all the blame on Adam. Sometimes it works, sometimes Adam goes down with him, but there's never a moment, where Adam doesn't get in trouble.
- Crazy Jealous Guy: A rare male-on-male example whenever Adam hangs out with somebody else.
- Everything's Better with Monkeys: A spider monkey.
- Idiot Houdini: Usually when he causes mischief, Adam gets the blame.
- Jerkass: Not such a good pal to Adam.
- Jerk with a Heart of Gold: He does care about Adam deep down.
- The Lancer: To Adam.
- Large Ham: Like other characters played by Tom Kenny.
- Never My Fault: Never takes responsibility for his actions. Ever. Most of the time, the blame is placed on Adam.
- Nice Hat: Got a cool, blue baseball cap.
- Prehensile Tail: Well he is a spidermonkey after all.
- Running Gag: His obsession with his own butt.
- Sanity Slippage: Jake's mental state is incredibly fragile and can oscillate from calm and friendly to psychotically dangerous at a moment's notice.
- Sensitive Guy and Manly Man: Manly Man to Adam's Sensitive Guy.
- Verbal Tic: Tends to add "Be Somenbody" to the end of sentences, where he tries persuading someone to do something.
- With Friends Like These...: He's willing to throw Adam under the bus whenever Jake does something bad.
Voiced by: Rick GomezA highly intelligent lowland gorilla who serves as the anti-bully at the school and often gives confusing wisdom to people. He speaks in a soft-spoken and nearly monotonous manner, often stringing together technical words as a matter of his normal speech.
- Ambiguously Bi: In The Hyena And The Mighty, he calls Rufus Hyena his sweet, implying the two may be in a relationship despite Rufus being a one shot character. However, later, he was seen being attracted to another female gorilla.
- The Big Guy: A large gorilla.
- Black Face: Lampshaded in "Flesh Fur Fantasy", when Windsor got offended by Adam dressing as a gorilla.
- Brainy Brunette: He is considered "brainy" and his hair does in fact have brown pigments. Fits like a glove.
- Comically Serious: Sometimes, he can be at his funniest, when he's just explaining something logically.
- Deadpan Snarker: Prone to sarcasm.
- For Science!!: That's Windsor alright.
- Genius Bruiser: He's both intelligent and powerful.
- Gentle Giant: Despite his massive physique, he's perfectly capable of taking care of a baby for a school project.
- Parent with New Paramour: Windsor played the "disapproving kid" role, when Mr. Mandrill started dating his single mother.
- Sesquipedalian Loquaciousness: Windsor tends to make his sentences as overly eloquent as possible, by throwing in as much big smart words as could possibly substitute shorter ones.
- Shown Their Work: Gorillas are known to be large, intelligent and generally mild-mannered. Windsor's status as a stoic Genius Bruiser fits perfectly in this regard.
- Adorkable: Shows shades of dorky behavior. She's gawky, gangly and sweet.
- Apologises a Lot: She's sort of been programmed to say she's sorry, whenever someone gets mad at her, whether she actually did them wrong or not.
- Break the Cutie: Quite a few episodes do this to her.
- The Chick
- Cute and Psycho: Her obsession with Adam causes her to become aggression and dangerously insane at times.
- Cute Clumsy Girl: Tends to trip frequently.
- Clingy Jealous Girl: She tries to break up Kerry and Adam more than once.
- Dogged Nice Girl: To Adam.
- Huge Schoolgirl: The tallest student in the school (her head is out of the screen most of the time).
- Interspecies Romance: Her crush on human boy, Adam Lyon.
- Long Neck: Perfect example.
- Shrinking Violet: A shy gorilla.
- Stalker With a Crush: To Adam of all people.
- Yandere: She can get pretty crazy about her crush on Adam.
Voiced by: Rick GomezAn easy-going, street-talking green tree python. He is an underachiever and excessive daydreamer who's gullibility allows him to believe anything he hears, which makes him a constant source of misinformation.
- Beware the Silly Ones: Despite being a ditzy and a self-admitted "loser flunkie", he's the only member of the group who is an actual carnivore, and can be rather dangerous when he becomes hungry.
- Catch-Phrase: Using phrases like "Dude" and "Brother", when talking to anybody.
- Cloud Cuckoo Lander: His antics and personality make him border one being one
- The Ditz: Moreso the anyone else in the show. He is very gullible.
- Does Not Like Women: Slips is the only member of the pack, who's never had a love interest, girlfriend, etc. He's an independent dude, who just doesn't have the time or effort for chicks.
- Dumb Is Good: Seems to be the most laid-back and care-free member of the pack, due to his stupidity and lack of knowledge about anything going on around him.
- Dumbass Has a Point: Slips is actually a distinguished, highly sophisticated young man, whose intelligence is being repressed by Jake and his peer pressuring behavior, as seen in "The Ivy League".
- Enlightenment Superpowers: In "Mellow Fellows", he had a deep understanding of human and animal emotions and was able to effortlessly solve people's most internalized of mental and psychological distress in seconds.
- The Heart: He's the member of the pack with feelings.
- I Have No Son: Though it's never seen on screen, Slips heavily implies in dialogue, that his father disapproves of him being such a failure. Fortunately, he seems to delightfully dim-witted to notice.
- Invisible Anatomy: Though it's rarely ever shown, Slips will prove the ability to manipulate his sleeves, despite having no arms.
- Non-Mammalian Hair: His blonde hair
- Reptiles Are Abhorrent: Averted. He's actually a pretty decent guy.
- '70s Hair: He's got a blond wavy gravy hairdo, which goes great with his hippie-like personality.
- Shown Their Work: Pythons are slow-moving, nearly silent animals that can often be found hanging from tree branches and sunning themselves, especially after a particularly big meal. Imagining one as a laid-back slacker is not much of a stretch.
- Surfer Dude: Talks like this.
- The Stoner: Acts like one.
Guadalupe "Lupe" Toucan
- Berserk Button: Telling her you don't think she's pretty.
- Funny Foreigner: She'd probably be nothing more than the token Hispanic friend if cast was all humans.
- Gag Nose: Or in this case, a beak.
- Genki Girl: Loud, exuberant, crazy at times.
- Henpecked Husband: This is how she treats her boyfriend, Corey.
- Motor Mouth: Often runs her beak, in conversations with Ingrid or Corey.
- Jerk with a Heart of Gold: Lupe has a good heart despite how annoying she is.
- Secret Identity Vocal Shift: In "A Very Special Boy", she reveals that her real voice is perfectly normal and she speaks fluent English. She just disguises it with a loud, raspy, Spanish accent, to ward off predators.
- Small, Annoying Creature: She can be this at, her very worst.
- Spicy Latina: She talks with a Latino accent that's super seductive.
Virgil "Bull" Sharkowski
Voiced by: Phil LaMarrA bull shark and the school's bully.
- Always Someone Better: His older sister is a way better bully than he'll ever be. He's extremely sensitive about this fact. Especially so when she managed to teach Adam to go frenzy in minutes though trolling. A concept he himself spent the whole episode trying to teach the ever oblivious Adam to no avail.
- Big Little Brother: His older sister is much smaller he is.
- The Bully: At least until his big sister comes in.
- Mobile Fishbowl: Wears a special headset over his gills to breathe while on dry land.
- Only Known by Their Nickname: He's mostly called "Bull"
- Verbal Tic: Takes a deep breath between his words every once in a while.
- 15 Minutes of Fame: Earned that in "Disregarding Henry".
- Adorkable: Some might see him that way.
- American Accents: Southern
- Butt-Monkey: If there's anyone at the school, who gets crapped on more than Adam, it's Henry. Unlike Adam, however, he still manages to keep a bright and sunny attitude no matter what happens to him.
- Cheerful Child: Even though he's probably the most mistreated, unfortunate soul at Charles Darwin Middle School.
- Harmless Villain: In "Making the Grade", he turned to the dark side and caused no harm.
- Nerd Glasses: Wouldn't be complete without them.
- Nice Guy: He's a kind, loving creature to everyone. And that's the reason, he's the school's biggest target for bullying and abuse.
- Too Kinky to Torture: He seems to like everyone treating him like crap.
Phineas Porpoise and the Spiffies
Voiced by: Phil LaMarrA nerdy bottlenose dolphin and his posse of gifted students.
- The Bully: He's a rare example of a nerd being one of these, being an Insufferable Genius who lords his intelligence over everyone, especially Adam.
- Catchphrase : In "Shark Fin Soupy", it was "How Cliche."
- The Dreaded: As noted in one episode, it's not recommended that one barrows from the Spiffies because they tend to ask for favors in return. Likewise, the other students hate the idea of being in a class with them.
- Extraverted Nerd: Doesn't seem to care about being humiliated.
- Hollywood Nerd: For an anthropomorphic dolphin, he doesn't look too shabby.
- Insufferable Genius: Phineas has quite the large opinion of his intellect.
- The Leader: Phineas is this of his fellow nerds: a pig, an elephant, an octopus, and a parrot.
- Nerd Glasses: The entire gang wears this.
- Nonindicative Name: Though Phineas Dolphin doesn't quite have the same roll off the tongue.
- Shown Their Work: Real bottlenose dolphins are famous for their intelligence and infamous for having many less than amiable behaviors. Hence, Phineas combines those two traits and becomes a nerdy version of The Bully.
- Sickly Neurotic Geek: Talks like this.
- Smart Ball: Seems to know pretty much everything. So long as it's about Prisons and Lizards, that is.
- Smart People Wear Glasses: Gang members of The Spiffies can be identified by their iconic glasses.
Margaret Rhino, Joanna "Joanie" Ox, and LeTanya HippoA trio consisting of a Sumatran rhino, cape buffalo, and hippopotamus.
- Big Beautiful Woman: Although, I wouldn't be too sure about the whole "beautiful" part.
- Big Eater: All three of them.
- Brainless Beauty: All of them, but Joanie seems to be the dumbest of the few.
- The Cheerleader: All three of them are on the CDMS Jungle Girls team.
- Fat and Proud: I hope to God they are.
- Girl Posse:
- Rhino Rampage: Can happen with Margaret, through Le Tanya tends to be the angry one of the group.
- Sassy Black Girl: Latanya. How couldn't she be, when having the unmistakable voice of Cree Summer?
- Valley Girl: Joanna
James AntA macho red ant, who seems to have no trouble, humiliating himself. He's smallest student at Charles Darwin Middle School.
- Casanova Wannabe: Acts like a real hunky ladies man, but can't get a girlfriend.
- Extreme Doormat: Allows himself to be literally stepped on and treated as such by just about everyone.
- Farm Boy: He was this in "My Science Project", working on an Ant Farm.
- The Friend Nobody Likes: Doesn't seem to win the affection of his only friend, Henry. Probably because he can't even get his first name right.
- I Just Want to Have Friends: Despite his expressive and talkative personality, he comes across as annoying to everyone he meets and has little to no friends. Even his lame, nerdy friends don't like him.
- Kid-anova: Although his attempts at winning over the women almost always fall flat.
- Nice Guy: No matter how many times he's crushed or stepped on, he seems to hold no anger toward anyone at the school.
- Petite Pride: Seems to have no trouble with being smaller than a bean.
- The Social Expert: He's got all the deets on every other student at the school, from their motives, to their personalities, and so on.
- Solar-Powered Magnifying Glass: Managed to burn himself, by inventing a solar powered tractor for himself, which tragically backfired.
- Strong Ants: Subverts this.
- Tiny Guy, Huge Girl: This was his short-lived relationship with Sheila Anteater in "Lupe in Love".
- Tiny Schoolboy: Taken to extremes.
Voiced by: Creator/Tom KennyA sugar glider and the school jokester.
- Backstory Horror: In "That Darn Platypus", his permanent record implied that before coming to CDMS, he actually had a horrifying, past. Mrs. Warthog was terrified by what she saw and urged Principal Pixiefrog not to look.
- Catchphrase: "Hello, How's Your Trousers?"
- Funny Foreigner: He's the school's funny Australian kid.
- Nonindicative Name: Lampshaded in "That Darn Platypus" and "The Ivy League", where Principal Pixiefrog and Mrs. Warthog would discuss the fact that Dickie is actually a sugarglider. There's no such this as a sugarjumper.
- Real Men Wear Pink: Dickie is the only male cheerleader at the school.
- Stock British Phrases: Uses quite a few of these.
Principal Poncherello Pegone Pixiefrog
- Bunny-Ears Lawyer: Although not very bright, he has been shown to handle crisis quite well.
- Dean Bitterman: Averted. Though on one occasion he threaten Adam to get Henry to stay in the schoolnote or else would send him to Siberia, though later he admit he was bluffing.
- Pint-Sized Powerhouse: He once beat a rhinoceros in a wrestling match.
- The Napoleon: He's a tiny frog that's in charge of the whole school.
- Reasonable Authority Figure: When the entire student body (even Adam) turns on Slips because they don't understand that he's shedding and thought he had a disease, Pixiefrog clears up the misunderstanding by having them watch a documentary on shedding.
- Small Name, Big Ego: And small body.
- Why Did Ithave To Be Snakes: Well,...lawyers actually. A Running Gag is him trembling or changing his mind when the idea lawsuits are brought up.
Mrs. Geraldine Sharon Warthog
- Apathetic Teacher: Or secretary in this case.
- Sassy Secretary: Responsible for most of the jokes around Pixiefrog.
- Only Sane Man: At times, in comparison to the other faculty.
- Trademark Favorite Food: Chocolate, which she'll devour upon command.
Mr. Cyrus Hornbill
- Butt-Monkey: Mr. Hornbill has many misfortunes.
- Gentle Giant: He's a rhino who's a good guy.
- Non-Indicative Name: Hornbills are a group of birds found in Asia, but he's actually a rhinoceros.
Mr. Maurice Mandrill
- Hippie Counselor: He's the school's psychologist and music teacher..
Voiced by: Nika FuttermanThe overly-dramatic drama teacher.
- Large Ham: Her voice can go eerily high.
Coach Tiffany Gills
Voiced by: Brian Doyle-MurrayA deep-voiced goldfish and the school's gym teacher.
- Large Ham: She almost always talks in a loud voice.
- Mobile Fishbowl: Teaches from a bowl wheeled around by Vice Coach Horace.
- The Napoleon: She's a tiny goldfish who is aggressive.
- Tertiary Sexual Characteristics: Her eyelashes and bow
- Vocal Dissonance: You wouldn't expect a goldfish to have such a deep voice, would you?
Vice Coach Horace Ferret
Voiced by: Tom Kenny and Robert Goulet in Animal School MusicalCoach Gills' ferret assistant.
- Cute Mute: A cute ferret who doesn't speak.
- Perpetual Frowner: Not so smiley.
- Satellite Character: To Coach Gills
- Silent Snarker: His facial expressions convey snark.
- The Voiceless: Except in Animal School Musical
- Weasel Mascot: More like Ferret Mascot.
Mrs. Eugenia Tusk
Voiced by: Cree SummerThe lunchlady.
- Funny Accent: Jamaican
- Gentle Giant: A tall, kind sort.
- Love Interest: To Mrs. Hornbill (despite the fact she's married)
Nurse Jacquline Gazelle
- Dumb Blonde: Played with. She mentioned that she's got a brain the size of a peanut in "Inoculation Day" but, otherwise, doesn't seem to be any dumber than any of the other characters.
- Jerkass Ball: Tried to shave Rufus's hair off for no reason in "The Hyena And The Mighty".
- The Medic: Due to being a school nurse.
- School Nurse: Duh.
Voiced by: Dee Bradley BakerA whale who is usually seen as the teacher of the nerds. Accompanied by whale noises whenever he talks.
Voiced by: Cree Summer
- Ambiguously Brown: Her voice actor is black, making it likely, though compared to other black humans in the show, she looks more Hispanic or Latina.
- Love Interest: She's one of Adam.
- Peek-a-Bangs: Her other eye is never seen. So much so, that it turned into a running gag in season 4.
Voiced by: N/A
- The Ghost: Adam's parents and other relatives often mentioned but usually never seen.
- The Voice: Adam's mom was heard in one episode.
- Adam's grandma's voice was heard, however, we do see her with most of her body out of view (we see her hand pointing).
Mr. I Didn't
Voiced by: Phil Lamarr
Euripides SharkowskiBull's older sister.___
- Big Brother Bully: Implied, consider Bull hated asking for her help and she seems to be the more dominant of their relationship.
- The Ghost: Was mentioned when Bull barrowed her spare gill phones.
- Lady Looks Like a Dude: Although she more sounds than looks like, however, she does, for some particular reason, have a mustache
- Little Big Sister: She's older than Bull, yet he is bigger than she is.
- Pink Is Feminine: She's seen wearing a pink outfit and her "gill phone" (in one episode where Bull barrowed her spare pair) are a hot pink
- Tomboyish Name: Euripides is a male name
- Tomboy Ponytail: Her blonde hair is tied in one.
- Your Mom: Her insults featured this
Voiced by: N/AWindsor's Mother
- Flower in Her Hair:According to her cameo appearance.
- The Ghost: Besides a cameo appearance in the background, she's mostly mentioned.
- Interspecies Romance: Dated a frog, a rhino, and then mandrill
- Parent with New Paramour: Apparently, she's divorced, as this trope was the subject of one episode where she starts dating Mr. Mandrill and Windsor hating the idea of the former marrying her.
- Really Gets Around: Downplayed but she did date Principal Pixiefrog and Mr. Hornbill before getting to Mr. Mandrill.
Voiced by: Creator/Gilbert GottfriedAn obnoxious platypus who told annoying jokes, and was believed to be an evil alien by everyone else.
- Annoying Laugh: Laughs in a loud, raspy, obnoxious voice.
- Brain Food: Constantly made jokes about sucking brain juice.
- Everything's Better with Platypi: Or worse in this case.
- Evil All Along: Though, throughout his appearance, they were doing the Good All Along trope, it was subverted at the very end.
- Evil Laugh: That's probably what the annoying laugh secretly was.
- Faking the Dead: Pretended to drown, as a joke.
- Starfish Aliens: His true form.
- You Have to Believe Me: The reverse in this episode, where everyone had the crazy belief that Rick was an alien and nobody believed Adam, when he thought he was a normal platypus.
Rufus HyenaJake's hyena friend, with a real sense of humor, to say the least.
- Annoying Laugh
- Break the Cutie: Insulted by Adam, cried several times throughout his episode, terrorized by Nurse Gazelle, threatened by the former at one point
- The Hyena: Literally
- The Voiceless: Didn't actually speak until the end of the episode, when he was brought back to laughter again.
- Mood-Swinger: Went from laughing to crying and back again pretty quickly.
- Ocular Gushers: Does this when he cries.
- Puppy-Dog Eyes: He's downright adorable when he pulls it off.
Larry RaccoonA racoon who was expelled from CDMS.
- Noodle Incident: How he got expelled isn't quite said but his delinquency had something to do with it.
Voiced by: Dannah FeinglassThe only other human other than Adam. She pretended to be raised by possums, just to get transferred to Adam's school.
- Cute Mute: Though it's all an act, she pulls it off pretty well.
- Fangirl: Has developed some sort of fandom for Adam.
- No Name Given: Not even in the credits.
- Raised By Animals: That's what her false backstory is.
- Stalker With a Crush: Her deal with Adam.
- You Have to Believe Me: Adam was the only one who knew she could talk and function like a normal human, but nobody believed him.