- Voiced by: Isabella Niems
A shy and quiet girl.
- Character Tic: She can often be seen playing with her hair.
- Extreme Doormat: In "Slumber Party" when Clarence thinks she invited him to her slumber party she's too much of a pushover to tell him she didn't.
- Fashionable Asymmetry: Wears her long hair to one side.
- Girly Girl: Loves dolls, slumbers parties, makeovers, etc.
- Hair Decorations: Wears a bow.
- Long Hair Is Feminine: She has long hair and is very feminine.
- Odd Friendship: Starts out annoyed and grossed out by Clarence. Goes on to have a fun night full of merrymaking with him.
- Security Blanket: Strokes her hair even harder when she's nervous.
- Shrinking Violet: Kimby is a major introvert.
- The Cutie: Oh, so much. A lot of fan-art have been made for her.
- The Quiet One: She's not much of a talker.
- Town Girls: Together with Courtlin, she plays the femme to Chelsea's butch and Malessica's neither.
- Traumatic Haircut: Is convinced by Chelsea to cut her hair in "Plant Daddies" and immediately begins crying.
- True Blue Femininity: Often wears a blue dress.
- Voiced by: Ivy Bishop
One of Kimby's friends. She used to have a crush on Jeff.
- Adorkable: Best shown in the slumber party episode.
- Hidden Depths: According to test scores in "Average Jeff", Malessica's intelligence is fairly average; somewhere above Jeff.
- Meganekko: So far, the only female student we see wearing glasses
- The Smart Girl: Practically a female Jeff, though without being obsessed over organizations
- Town Girls: The neither to Kimby and Courtlin's femme and Chelsea's butch.
- Voiced by: Tayler Buck
Kimby's other friend. All three of them are usually seen together.
- Voiced by: Skyler Page (season one), Spencer Rothbell (season two), Grace Kaufman ("Capture the Flag" onwards)
- Voiced by: Mckenna Grace, Anastasia James (crying voice)
- Bitch in Sheep's Clothing: She seems sweet and naive on the outside, but has a greedy and selfish soul.
- Crocodile Tears: Gave Clarence her chocolate bar and then cried and claimed he stole it from her.
- For the Evulz: Does mean things and admits she doesn't know why.
- Jerkass:Even more so than Belson
- Karma Houdini: In "Patients", unless the jar of candy being destroyed was her punishment.
- Kick the Dog: Ate candy right in front of Clarence knowing he couldn't have any.
- Manipulative Bitch: Turned everyone in the waiting room against Clarence.
- Sweet Tooth:Attempted to steal a candy jar.
- Wounded Gazelle Gambit: When Clarence was too tired to do any more favors, she gave him a candy bar, only to issue a fake apology and frame Clarence by falsely claiming he stole her candy.
An odd kid who doesn't seem to move very much, if at all.
- Ambiguous Disorder
- Behind the Black: He only ever moves when off-screen.
- Creepy Child: Though he's not considered one in-universe.
- Early Installment Weirdness: He moved on-screen in earlier episodes.
- Informed Attribute: All the kids talk about him as if he's a really cool and awesome guy. Since we never see him talk or move, we have to take their word for it.
- Living Prop: Quite literally. He's, for all intents and purposes, a mannequin, even though the others act as if he were alive.
- Muscles Are Meaningless: His arms are fairly thin, but he once beat a high schooler - a ridiculously muscular one - in arm wrestling.
- The Noseless: He doesn't have a nose.
- Offscreen Teleportation: With the exception of early episodes, he would not move or even change positions onscreen unless something or someone was moving him.
- Recurring Extra:By virtue of being a Living Prop
- The Silent Bob: He never talks, though other kids somehow hear him talking anyway.
- The Stoic: His face is perpetually stuck in that stupid look on his face. There was one exception to this in the Li'l Buddy episode, where he appeared to be just as creepers out as the other kids.
- The Voiceless: He talks to other kids but not onscreen.
- Voiced by: Spencer Rothbell
A short, odd redheaded girl.
- Absurd Phobia: For some reason she's scared of fire hydrants.
- The Noseless: She has a noseless face.
- Recurring Extra: She shows up more so than the other girls.
- Redheads Are Uncool: She's a bashful redhead who speaks eccentrically and has numerous odd quirks.
- Shrinking Violet: She's really shy and awkward.
- The Quiet One: When her voice is heard, she just mutters nonsense.
- The Unintelligible: Mostly speaks in mumbling.
A trio who slightly resemble darker-skinned versions of Percy, Dustin, and Nathan, respectively.
- Voiced by: Skyler Page (season one), Damien Haas (recent)
A rather large girl who's one of Ashley's friends.
- Abhorrent Admirer: Has a crush on Jeff, as seen in "Suspended"; Jeff seems less than pleased about it.
- Crossdressing Voices: Both of her voices were male.
- Foreshadowing: Her name was mentioned in "Pretty Great Day With a Girl", when Nathan and Dustin ask Belson to clarify whether Clarence was with this Amy or with Amy Gillis.
- Gonky Femme: Downplayed, as, while she's big and bulky, she mostly sounds male.
- Expy: She and Grenda from Gravity Falls are very similar, as both are young female characters who sound more male than female, wear pink, have brown hair pulled back into a ponytail, and are physically very strong.
- Huge Schoolgirl: Goes to school and is tall and bulky.
- One Steve Limit: Averted, as, before she moved, there was Amy Gillis.
- Tomboy Ponytail: Expy had explained this.
- Younger Than They Look: As large as she is, she's in the same grade as Clarence and friends.
A redheaded droopy cheeked kid.
- Amusing Injuries: Gets his cheeks deflated in Lost Playground.
- Expy: His red hair, saggy cheeks, and voice are reminiscent of Droopy.
- The Klutz: Him being this kicks off the plot of Lost Playground, as he gets hurts twice, which costs the kids their recess and playground equipment.
- Missing Mom: Lost Playground implies that his mother (supposedly, a girl named "Lucy" who appears in a flashback with his dad) may have passed away, assuming his parents didn't divorce. To add to this we only see his dad.
- Overprotective Dad: His dad, Hershey in Lost Playground, whose zealousness gets the playground shut down, until he actually recalls fond memories of his time on the playground and relents.
- Strong Family Resemblance: To his dad, Hershey, sharing red hair, droopy cheeks, and freckles.
- Youthful Freckles: They're subtle.