Recurring
Bradley "Brad" Buttowski (voiced by Danny Cooksey) is Kick's 15-year-old older brother. He bullies and insults Kick and Gunther, and is in charge when their parents are away. Brad also has poor personal hygiene and thinks he is popular. His favorite phrase is "dillweed", which he uses to refer to Kick and "Yeah, Brad", which is his catchphrase. He is a self-proclaimed "ladies' man" and will try to woo women. He usually fails in this goal. He has lackeys, who sometimes do his bidding or achieve his goals such as bullying Kick and Gunther. He is good at manipulating people, especially his parents, to get out or get people in trouble. His manipulations backfire at times.
Brianna Buttowski (voiced by Grey DeLisle) is Kick's spoiled 7-year-old younger sister. She's mainly known for being a "pageant girl". Being the youngest, she usually gets her way by saying "I want..." When not participating in pageants, she likes to annoy her brother Kick, holding on to anything that's valuable to him, like his favorite cereal and tricycle. Unlike their eldest brother Brad, she seems to have mutual respect for Kick. She is capable at working with him, provided that it is on her own terms. She appears to dislike Brad. Her favorite show is Teena Sometimes, which is why she is always dressed like its main character.
Harold Buttowski (voiced by Brian Stepanek) is Kick's overcautious and neurotic father. He is usually cheery and easygoing but is also attentive about possible sources of danger. He also has an unhealthy love for his 1979 AMC Pacer Wagon, calling it "Monique", and his wife does the same by calling her car "Antonio". He is obsessed with his wife's homemade cookies to the point of harming or bribing anyone who gets in his way. He seems to enjoy opening letters. He was a master at ping pong when he was growing up, as shown in "Bad Table Manners".
Honey Buttowski (voiced by Kari Wahlgren) is Kick's mother. She is infrequently at home, as she and her husband take their daughter Brianna to compete in beauty pageants. She is caring and protective of Kick, and although she's often worried about him, she acknowledges his daredevil nature, sometimes even helping him with his stunts. In "Kickin' Genes" it is revealed that she was once a famous daredevil and speedboat racer called "Honey Splash". She gave up her life as a daredevil when she became pregnant. It is also shown that she was the one who gave Kick his trademark white jumpsuit as a present, to show him how much she supports him. Her home baked cookies are tasty, to the point of driving people crazily obsessed and wanting more, even herself.
Secret Spy Buttowski (voiced by Ed O'Neill) is Kick's grandfather. He was a spy who spied on a military general to beat and stop his evil plan in "Truth or Daredevil".
CEO of Food 'n' Fix (voiced by Jeffrey Tambor) is Wade's chief in "Wade Against The Machine", in which he makes his first and only appearance. He is the CEO of the parent company that owns the Food 'n' Fix service station where Wade works. He is very naive, as he promotes Wade for actions that are not useful to the company, yet these things are what Kick and Wade are doing to try and get Wade demoted back to his old job. At the end of the episode he even promotes a turtle, because the turtle walks slowly and he says, "We move way too fast around here. Promotion!".
Wade (voiced by Eric Christian Olsen) is a gas station worker and is friends with Kick. In "Stumped", Wade supplies Kick with Cheetah Chug, in hopes of finding a key. The key was a free ticket for Kick to see his favorite monster truck star, Billy Stumps. He is very calm and commonly clumsy, to the point of forgetting what he was previously doing.
Billy Stumps (voiced by Jeff Bennett) is an extreme daredevil who is famous, and one of Kick's idols. He is missing his left hand for unknown reasons, presumably from one of his stunts. He appears as a cameo in a poster by Kick's door. He helped re-inspire Kick to do stunts when he lost his helmet (thanks to a call from Gunther in "Exposed!") with his standard "been there, done that" experience. He is always seen with his favorite hood ornament, a golden horseshoe.
Magnus Magnuson (voiced by Clancy Brown) and Helga Magnuson (voiced by April Winchell) are Gunther's parents. They own a BMW Isetta and a restaurant called "BattleSnax". They are Vikings, lived in the Nordic country and are shown to have a deep friendship with the Buttowski Family.
Bjørgen (voiced by Danny Jacobs) is Gunther's uncle. He works at BattleSnax and often says words that rhyme with his name. He can speak regular English in later episodes. He is a Viking and lived in the Nordic country.
Announcer (voiced by Jess Harnell)
Teena Sometimes (voiced by Tiffany Thornton) is the star of her self-titled show, which was first mentioned in "Stumped!". She is a part-time spy and a part-time princess. She is also a singer. Her catchphrases are "I'll sparkle you until next week," and "Consider yourself sometimes!"
Principal Henry (voiced by Henry Winkler) is the principal of Mellowbrook Elementary School who loathes doing paperwork and isn't entirely bothered by Kick's antics, as long as he graduates. This is made apparent in "Frame Story".
Walter (voiced by Jeff Bennett) works at the Food 'n' Fix when Wade is promoted. He also works at a flower shop in Mellowbrook in "A Very Buttowski Mother's Day".
Kendall Perkins (voiced by Emily Osment) is Kick and Gunther's classmate, one of Kick's arch-rivals, and, as revealed in "Kick or Treat", one of Kick's next-door neighbors. She loves learning and is the president of her class (former as of "Poll Position"). However, she is also apparently bossy, arrogant, selfish, and high-strung and has few friends. She and Kick both claim to hate each other, but they also serve as each other's love interest. She typically refers to Kick as Clarence, his first name.
Mr. Perkins (voiced by Charlie Schlatter) is Kendall's father, who is an actuary and makes his first speaking appearance in "Father From The Truth" and second in "Crumbs!", while the rest of his appearances are non-speaking cameos.
Mr. Vickle (voiced by John DiMaggio) is Kick's next-door neighbor. A heavyset middle-aged bachelor with an effeminate personality, he's one of the few adults who isn't ruffled by Kick's behavior, with the exception of his appearances in "Kick the Habit" and "Nerves of Steal".
Jock Wilder (voiced by James Arnold Taylor) is one of Kick's daredevil idols and the founder of "Jock Wilder's Nature Camp". As a child, he was raised in the wilderness by wolves. He loves the untamed outdoors and is often ready to "dive into nature and face a fiery fury".
Larry Wilder (voiced by Jim Parsons) is the brother of Jock Wilder and co-camp master of Jock Wilder's Nature Camp. Unlike his brother, who was raised in the wild by wolves, Larry was raised by chihuahuas.
Scarlett Rosetti (voiced by Alyssa Milano) is the female counterpart of Kick Buttowski. She makes her first and only speaking appearance in "And... Action!". She is originally Teena's stunt double in the show Teena Sometimes but later becomes Scarlet Letter, Teena's nemesis.
"Wacky" Jackie Wackerman (voiced by Maria Bamford) is a humorous and hyperactive resident of Mellowbrook. She became obsessed with Kick in her debut appearance in "Obsession: For Kick", later stalking him due to her being his "number one fan", as well as being the president of his fan club.
Glenn (also known as Clerk) (voiced by Brian Doyle-Murray) is a grocery store worker. Whenever Kick shows up in the Mellowmart grocery store, he is sure Kick will wreck "his store", leading to trouble for Glenn.
Janelle (voiced by Kari Wahlgren) is a cashier at the Mellow*Mart, and she likes to fool Brad.
Pantsy (voiced by Harland Williams) is one of Brad's friends and Mouth's older brother. Like Brad, he bullies his little brother, Mouth. He is also the assistant manager of the Mellowbrook Megaplex and has a strict policy when it comes to patrons. He usually wears 3D glasses.
Horace (voiced by Greg Cipes) is Brad's other friend. He has green hair that covers his face. It is revealed in "Kicked Out" that he's not all that smart.
Christopher "Mouth" (voiced by Richard Steven Horvitz) is Kick and Gunther's frenemy and classmate. He is the son of the 2nd assistant security guard at Mellowbrook Mall and is also Pantsy's younger brother. He schemes a lot and he loves playing shuffleboard. It is shown in "Detained" that he can get a hold of anything. He idolizes Rock Callahan along with Kick and Gunther (as shown in "Box Office Blitz").
Coach Sternbeck (voiced by Mike Golic) is a Kick's personal trainer in "Gym Dandy".
Ms. Dominic (voiced by Veronica Cartwright) is a gym teacher in Mellowbrook Elementary School.
Ms. Fitzpatrick (voiced by Roz Ryan) is Kick's teacher that stays in his face. Her catchphrase is "Mmmm-hmmm", which is also on her license plate. She often calls Kick, Mr. Buttowski.
The Librarian (voiced by Susanne Blakeslee) is the librarian at Mellowbrook Elementary School. She's brutal, just like Ms. Chicarelli (but even worse), and tries to kill Kick in "If Books Could Kill". She is shown to be power-hungry and claims anything put in the library return box as hers, including a book belonging to Kick and even a sandwich Gunther dropped. She makes a second speaking appearance in "Shh!" when Kick goes to the library with a Nuzzlet he has to study. She threatens to kill Kick if he wakes her from her nap, but when she wakes up she thinks Ronaldo is the one responsible for destroying the library. Because of this, she tries to kill him with a laser, in a reference to the James Bond film Goldfinger.
Charlotte Chicarelli (voiced by Mindy Sterling) is one of Kick's next-door neighbors. She always tattles on Kick and the other kids on the cul-de-sac for causing any kind of disruption.
Oskar is Charlotte Chicarelli's dog. He enjoys biting Kick's buttocks and chasing him. Kick and Oskar have a mutual hate for each other, though in "Dog Gone" they show mutual respect and a liking for each other, and a brothers-from-a-different-mother bond.
Ronaldo (voiced by Simon Helberg) is Kick and Gunther's classmate, and another of Kick's arch-rivals whose first appearance is in "Mellowbrook Drift". He is a physics-obsessed bully who cheats in the Tri-County Cartacular by following the laws of physics. His jacket is somewhat similar to Kick's jumpsuit, only with opposite colors; maroon with yellow stripes down the sleeves and a small cape in the back. He hangs around a small posse of other nerds and goes to Kick's school.
Rodney "Rock" Callahan (voiced by Kevin Michael Richardson) is one of Kick and Gunther's many idols. He is also an actor whose catch phrase is "Let's rock!", which he says while cracking his neck.
Cousin Kyle (voiced by Tom Kenny) is Kick Buttowski's cousin. He is a chatterbox and is also extremely dim-witted. In "Kyle Be Back," he gets in Kick's way from doing a record-breaking stunt. In "Kyle 2.0" it is revealed that he can create radio static just by being near it. Kyle is also a huge fan of Kick.
Papercut Peterson (voiced by Carl Faruolo) is a professional wrestler who helped Kick defeat Brad in "Drop Kick". He used to be known as Pile-Driver Peterson. He also won the Battle of the Bands by Auto-Tune. He appears in many episodes, although is never displayed as a wrestler but as an unhygienic, lonely man. He also often humorously refers to Gunther as being a 'little girl'. He has a lookalike in the Old Country, where Gunther and his family are from. His relation to this lookalike is unknown.
Shogun Sanchez (voiced by Carlos Alazraqui) is the older brother of Papercut Peterson who only appears as one of two main antagonists (along Brad) in "Drop Kick".
One-Eyed Jackson (voiced by Adam Carolla) is an old man who helps Kick and Gunther win a race against Ronaldo in "Mellowbrook Drift". He was formerly a professional kart racer until an accident on Turn 6, a deadly turn on Mount Hurtsmore. The show's creator, Sandro Corsaro, has revealed that he is a ghost. This is supported by the fact that he disappears in front of Kick and Gunther after the race in "Mellowbrook Drift", and again in front of Kick after paying him for mowing his lawn in "Mow Money".
Boom McCondor (voiced by Brian Vanholt) is one of the best stunt legends in the world. He had his first contest which Kick and Brad won in "Things That Make You Go Boom!". He usually has a catchphrase similar to a bird call.
Emo Kid (voiced by Greg Cipes) is a classmate of Kick and Gunther's and the son of Rowdy Remington. He dresses in black and purple and his hair is partly dyed purple. He makes his first appearance in "Snowpocalypse". He is known to have a strong dislike for dodgeball. He doesn't speak much, but when he does, he has somewhat of an Eastern European or Mediterranean accent.
Janitor Roberson (voiced by Fred Tatasciore) is a janitor at Mellowbrook Elementary School.
Gordon "Gordie" Gibble (voiced by Will Forte) is Kick's archenemy and (former) BMX legend who broke records after Kick won the BMX Rodeo. After his loss, he went into kart racing and other sports. He is from West Mellowbrook. He has a rich father, made apparent in "Kart to Kart".
Penelope Patterson (voiced by Jessica DiCicco) is Brianna Buttowski's pageant rival. Her major talents involve balancing objects, riding a unicycle, and reciting Shakespeare all at the same time. In "Sister Pact", she tries to sabotage Brianna's audition for the Poise Posse but fails and is kicked out of the group.
The DiPazzi Twins (both voiced by Sandro Corsaro) are named Michael Anthony and Anthony Michael. They appear identical except for different eyes and voices. They first appeared on "Clothes Call", and again along with Gordon on "Switching Gears".
Madison (voiced by Skai Jackson) is one of Brianna's friends. Madison is a cheerful African-American girl, who always say "Yay". Just like Brianna, she's a huge fan of Teena Sometimes and dressed up like the main character of the show.
Abbie (voiced by Doug Brochu) is Brianna's other friend. Abby is physically robust and speaks with a unusually masculine voice. She's also has a crush on Gunther. Just like Brianna and Madison, she's a huge fan of Teena Sometimes and dressed up like the main character of the show.
