Other
Asteroid is a talking asteroid who appears in the episode "Asteroid Blues".
Action Police is a police force who first appeared in "License To Punch".
Batty is a dark purple and black bat citizen in the Unikingdom with a stand for legs.
Beau (also voiced by Tara Strong) is a blue square with yellow stripes.
Beatsby is a yellow boombox with tiny-rounded arms and legs and light red eye sclerae. His toy counterpart has no arms and legs.
Bim-Bom Liebowitz (voiced by H. Michael Croner when speaking, Roger Craig Smith when coughing) is an anthropomorphic green garbage bag or dumpling who has somewhat of a sassy and sometimes antagonistic personality.
Burger Person (also voiced by Tara Strong) is a cheeseburger citizen of Unikingdom who dislikes being eaten.
Crabatar is a robot crab created by Dr. Fox who appeared in "Beach Daze" that is used to study crabs. At the end of the episode, she and the other robot crabs trap the gang in a "pinching dungeon" to torture them with pinching and she claims the Perfect Spot.
Craig (voiced by Tara Strong) is a moose who works as a farmer with an Italian accent.
Crankybeard (also voiced by Eric Bauza) is a bluish-grey tombstone-shaped old man with one wheel for a left foot who resides in Frowntown. He is also Brock's father.
Crazy Chicken is a chicken that is crafted out of a single brick.
Candy Fighters are six sentient candies who were brought to life by the gang in the episode "The Very Best Candy" to compete against each other for dominance over which is the best candy.
Cupcake Monster is a mutated cupcake created by Dr. Fox from "Crushing Defeat" that was blasted by Hawkodile.
Dainty (also voiced by Grey Griffin) is a blue circular-headed citizen with rectangular arms who usually drives a car.
Dino Dude (also voiced by Grey Griffin in 2017–18, Eric Bauza in 2018) is an Australian-accented Tyrannosaurus with wheels instead of legs.
Doom Lords are a group of villainous individuals that Master Frown is a part of that make their lair in a tall building in Frown Town. In the series finale, they were betrayed by Master Frown as he quits and are defeated by the power of friendship afterwards.
Master Doom (also voiced by Grey Griffin in a demonic voice) is the leader of the Doom Lords. She has a tendency to chastise Master Frown for his various failures and appears menacing to the other Doom Lords. She is distinguished by her heterochromia iridum, or odd-eyes as she has one purple iris and one cyan iris.
Master Papercuts is a member of the Doom Lords with a paper hat. He is the butt of the jokes and claims to do a better job than Master Frown.
Master Malice is a member of the Doom Lords with long green horns.
Master Hazard (also voiced by Roger Craig Smith) is a member of the Doom Lords with a fiery head and dark purple bat-like wings. He once burned down the Candy Corn Kingdom.
Master Misery (also voiced by Tara Strong) is a member of the Doom Lords with an olive-green diamond-shaped face and dark blue hair obscuring the eyes.
Master Fear (also voiced by Eric Bauza) is a member of the Doom Lords with a blue water drop-shaped face and hollow eye sockets.
Master Pain (voiced by Grey Griffin) is a female member of the Doom Lords with a white noh mask-like face and pale yellow pupil-less eyes.
Master Plague is a member of the Doom Lords with a green bird-like head and large eyes.
Dr. Bunny is a minor character who only appears on the Everything Is Awesome Tween Dream Remix video for The Lego Movie 2: The Second Part. She and Dr. Fox are friends.
Eagleator (voiced by Keith Ferguson) is an eagle/alligator hybrid and Hawkodile's rival and former best friend hailing from the Action Forest who wants to defeat him and take his shades after Sensei Falcamodo rewarded him with them.
Esteban is a character from the episode "Roadtrip Ruckus". He is a friend of Really Old Edith.
Father Time is the master of time who appeared in "Delivery Effect".
Feebee (also voiced by Grey Griffin) is a Southern-accented flower/bumblebee/ hybrid who runs "Feebee's Flower Shop". Her name is sometimes written as 'FeeBee'.
Flamurtle (voiced by Natasha Leggero) is a flamingo/turtle hybrid with a blue mohawk hairstyle who was the main antagonist of the episode "The New Nemesis". She was Eagleator's other sworn nemesis besides Hawkodile. After being defeated by Hawkodile and Eagleator, she returns to her true arch-nemesis, Owlamander.
Glandrea is a blue citizen whose head resembles a mountain with a flag on top.
Gluppycorn is a minor character from "The Unikingdom Awards" who resembles Puppycorn with Unikitty's color scheme. He was seen crying while Schmunikitty consoles him after losing an award.
Herbert Sherbert is an ice cream cone who works sells ice cream out of a pushcart. He also has a wife named Toni Spumoni-Sherbert.
Hominid is a green genderless alien that moves around in a UFO.
Kickflip (also voiced by Tara Strong in most episodes, Grey Griffin in "Little Prince Puppycorn") is a pink skateboard-riding square.
M'Ladybug (also voiced by Tara Strong) is a ladybug with a purple shell.
Owlamander (also voiced by Grey Griffin) is a character from "The New Nemesis". She is an owl/salamander hybrid. She is the true arch-nemesis of Flamurtle.
Old Timey Mustache Man (also voiced by Eric Bauza) is a green old man citizen who likes bouncy houses.
Q.T. (also voiced by Tara Strong) is a pink oval-headed humanoid citizen of the Unikingdom with a magenta bow on her head.
Really Old Edith (also voiced by Grey Griffin) is a blue-hunched-over figure who is one of the oldest citizens of the Unikingdom.
Rock Guy is a seemingly inanimate rock that is Puppycorn's friend.
Ryott (also voiced by Roger Craig Smith) is a green square man who screams instead of speaking.
Schmunikitty is a character from "The Unikingdom Awards" that resembles Unikitty with Puppycorn's color scheme. She consoles Gluppycorn, who was crying over losing an award.
Stellacopter is a purple creature with round hands that wears a fez that has a helicopter-like blade on it.
Stocko (also voiced by Kate Micucci) is a teal rectangle with arms and a bowler hat.
Score Creeper (also voiced by Roger Craig Smith) is a creepy Grim Reaper-like spirit villain who usually traps Unikitty and her friends in games such as "Spoooooky Game". He also tends to speak in rhyme.
Tap-Dancing Butterfly (also voiced by Grey Griffin) is a butterfly that likes to entertain an audience with her tap dancing.
Ted Butter (vocal effects provided by Roger Craig Smith) is a green duck-like citizen with a vertical rectangle head and vertically stacked eyes and an antagonistic personality.
The Tooth Fairy (also voiced by Grey Griffin) is a fairy who collects teeth with a Bronx accent. She appears in "Tooth Trouble" and the end of the same episode, she punishes the gang for stealing teeth by taking theirs.
Theodore (also voiced by Roger Craig Smith) is a brown bear with a smooth voice, a square head, long arms, and short legs.
Toaster (voiced by Roger Craig Smith) and Toast (voiced by H. Michael Croner) are a duo that consists of a toaster and a toast with arms that rides in him. They are sometimes referred to as the "Toast Bros".
Trevor is a lion-like creature with flower petals surrounding his head.
Townsperson (voiced by Roger Craig Smith) is an accident-prone citizen who is almost always in a dangerous situation.
