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- Gumball Watterson (Johnny Galecki): The oldest (and the only) son.
- Mabel Watterson (Anna Paquin): Gumball's twin sister.
- Martha Nuttels (Jennifer Lawrence): Gumball's girlfriend.
- Cobby Nuttels (Ben Stiller): Martha's brother, Mabel's boyfriend.
- Anais Watterson (Ariel Winter): Gumball's sister.
- Catrin Jakeson (Kelsey Grammer): One of Gumball's close friend, Mabel's best friend.
- Nicole Watterson (Alicia Keys): Gumball, Mabel & Anais' mother.
- Richard Watterson (Jerry Trainor): Gumball, Mabel & Anais' father.
- Rossa Peritzio (Nicola Peltz): A Italian girl who helps Gumball to catch the Egyptean Mummy of Doom.
- Chris Spacely (Christopher Lloyd): A manager who can enjoy anything.
- Bobert Shadowthourne (Paul Bettany): The Dark outcast. He becomes good after Cobby fixed him.
- Selim Khalazar (Jamie Lee Curtis): Gumball's Turkish guide in Other World.
- Kenneth Rolindran (Dee Bradley Baker): A secret agent.
- Maximus Vice (Frank Welker): A Decepticon who wants to kill Gumball.