Characters: My Gym Partner's a Monkey

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Adam Lyon

Voiced by: Nika Futterman

A 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".

Jake Spidermonkey

Voiced by: Tom Kenny

A spider monkey who quickly became Adam's best friend. He is often very possessive of Adam and hates not having him around regularly. Jake is emotional and goofy who takes to heart some of Adam's comments and actions, leading to some overly dramatic and exaggerated reactions. He can be lazy and selfish, but at the same time he is also fairly sensible.

Windsor Gorilla

Voiced by: Rick Gomez

A 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 Gay: 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 gorrila
  • The Big Guy
  • Deadpan Snarker
  • Genius Bruiser: He's both intelligent and powerful.
  • Gentle Giant: Despite his massive physique, he's capable of taking care of a baby for a school project.

Ingrid Giraffe

Voiced by: Grey DeLisle

A female masai giraffe. Her towering height only adds to her feelings of insecurity as she tries desperately to blend into the background. She has a crush on Adam.

Slips Python

Voiced by: Rick Gomez

An 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.

Guadalupe "Lupe" Toucan

Voiced by: Grey DeLisle

A female Keel-billed toucan, who is loud-mouthed, acerbic, dominating and materialistic, although she considers herself to be mild-tempered and low maintenance.

Other/Recurring Characters

Virgil "Bull" Sharkowski

Voiced by: Phil LaMarr

A bull shark and the school's bully.

  • Always Someone Better: His big 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.
  • 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"

Rufus Hyena

Henry Armadillo

Voiced by: Tom Kenny

A nine-banded armadillo with a Texas accent and a reporter in the school media.

Euripides

Deidre Koala

  • Big Eater: She loves anythinng eucalyptus, but takes a long time to digest it.
  • The Scrappy: In-universe example.

Larry Raccoon

Principal Poncherello Pegone Pixiefrog

Voiced by: Maurice LaMarche

  • 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 beats a rhinoceros in a wrestling match.
  • The Napoleon: He's a tiny frog that's in charge of the whole school.
  • Small Name, Big Ego

Mrs. Geraldine Sharon Warthog

Voiced by: Grey DeLisle

Mr. Cyrus Hornbill

Voiced by: Maurice LaMarche

Mr. Maurice Mandrill

Voiced by: Maurice LaMarche

Mr. Blowhole

Miss Chameleon

Voiced by: Nika Futterman

Coach Tiffany Gills

Voiced by: Brian Doyle-Murray

  • Large Ham: She almost always talks in a loud voice.
  • Mobile Fishbowl: teaches from a bowl wheeled around by Vice Coach Horace.

Vice Coach Horace Ferret

Voiced by: Tom Kenny and Robert Goulet in Animal School Musical

Mrs. Eugenia Tusk

Voiced by: Cree Summer

Nurse Jacquline Gazelle

Voiced by: Grey DeLisle

Ms. Gretchen Loon

Voiced by: Cree Summer

Ms. Bear

Voiced by: Tom Kenny

Kerry Anderson

Voiced by: Cree Summer

Chad

Voiced by: Tom Kenny

Possum Girl

Voiced by: Dannah Feinglass

LaTanya

  • Big Eater: Loves scarfing cakes, watermelons, and marshmallow mega-squares.