The series revolves around the daily life of 12-year-old cat Gumball Watterson and his family—adoptive brother Darwin, sister Anais, and parents Nicole (née Senicourt) and Richard.
[5][7] In "The Club", it is revealed that his middle name was supposed to be Christopher, but was actually misspelled as Tristopher ("Trisha" for short) on his birth certificate.
He is sometimes shown exhibiting strange behavior, such as calling his adoptive parents Mr Dad and Mrs Mom.
She sometimes exhibits childlike behavior and is shown as socially inept and incapable of forming friendships as she drives potential friends away with over-the-top clinginess.
Doctor Nicole Watterson (née Senicourt) is a 38-year-old[11] cat and the mother of Gumball, Darwin, and Anais.
Nicole is a master martial artist, knowing Karate and winning numerous tournaments when she was young.
In "The Parents", it is revealed that Doctor is her first name and Nicole is her middle name.Richard Buckley Watterson is a 38-year-old anthropomorphic pink rabbit.
Carrie Krueger (voiced by Jessica McDonald) is a ghost who lives in a malevolent mansion[18] and "enjoys being depressed".
Masami Yoshida (voiced by Jessica McDonald) is a cloud who is the wealthy daughter of the Rainbow Factory's owner.
[24] Bobert (voiced by Kerry Shale) is a robot who is one of the smartest students, but constantly struggles to understand emotion and develop a social life.
[26] Leslie (voiced by Kerry Shale) is an effeminate, friendly daisy who plays flute in the school band and can often be found hanging around the girls.
In "The Vision" it is revealed Alan secretly plans to take over the world and rule it as a dictator, brainwashing people to eradicate sadness.
[36] Anton (voiced by Tony Hull) is a piece of toast who is forcibly drafted into Tina's gang, hoping that by appeasing her he will avoid her anger.
[37] Juke (voiced by Hugo Harrison, music by Beatbox Hobbit)[38] is a native of Boomboxemburg with a boombox for a head and he moves to Elmore.
[42] Harry "Ocho" Tootmorsel[43] (voiced by Max Cazier) is an 8-bit spider[44] and a generally friendly person, but often overreacts to what people say about.
He originally spoke solely in video game blips; later began speaking in comprehensible, albeit distorted, sentences.
His parents are a stick of dynamite named Julius Oppenheimer Sr. and a firework rocket, who also have a 1920s rubber hose style.
He teaches music, judges cheerleader tryouts, leads the school's band, and is a substitute sports teacher.
[citation needed] Steve Small (voiced by Lewis MacLeod, season 1; Adam Long, season 2 onward) is the Elmore Junior High guidance counselor, a cloud man who is interested in New Age culture and possesses hippie-like appearance and behavior.
He lost his love Janice, which in the episode "The Void" is revealed to be a purple van that runs on "good vibes".
Coach Russo (voiced by Dan Russell) is a large, pink 3-dimensional cube who is Jamie's mother.
Granny Jojo (voiced by Sandra Dickinson) is the Watterson children's grandmother and also Richard's mother.
[55] Louie Watterson (voiced by Dan Russell in season 2 and "The Kids", Shane Rimmer) is a black mouse and a former member of a crew of Elmore senior citizens that includes Betty, Donald, and Marvin Finkleheimer.
Gaylord and Margaret Robinson (Gaylord voiced by Rupert Degas in season 1, Stefan Ashton Frank in season 2 onward, and Margaret voiced by Teresa Gallagher) are the Wattersons' stuck-up, grouchy, next-door neighbors, and Rocky's parents.
Gary Hedges or Harry Gedges (voiced by Dan Russell in "The Fridge" onward) is a neighbor of the Wattersons who lives on the left side.
In "The Neighbor", it is revealed that his real name is meant to be secret and his pseudonym is Harry Gedges by which Gumball and Darwin did not know him.
He was previously known as "Lazy Larry", the laziest person in Elmore until he lost his title to Richard and morphed into a hard worker.
Marvin Finkleheimer (voiced by Dan Russell in season 2 onward) is a red bean who lives at a house and likes to beat kids with his cane if they help him across the street.
Felicity and William Geoffrey "Billy" Fitzgerald Kitchener Parham, III (voiced by Sandra Searles Dickinson season 2 onward and Teresa Gallagher in "The Kids" for Felicity and Richard Overall for Billy) are an orange blob and a blue blob respectively.
Phillip "Mowdown" (voiced by Simon Lipkin) is a violent giant pink teddy bear who wears a shirt with a heart on it.