Dr. Butt's head appears to be an enormous butt, with a surprising amount of similarity to Richard's. He is dressed in a doctor's uniform, and wears glasses. In season 3, his appearance slightly changes. The butt crack on his face is longer, and his tie's shadow is also more transparent. In season 5, his appearance changes again. He gets a mouth and is taller and thinner. His head has stretch marks at the bottom, as well as hairs, and his pockets are more detailed.
- "The Goons": He appears in the hospital treating the contestants of the dumb race.
- "The Pizza": He appears in a flashback at Ripley 2000 trying to rent a movie, but due to Gumball, Darwin and Anais spoiling the movie for him, he farts at them and leaves.
Dr. Butt: [Looks and sounds like Richard's "Butt Puppet"] Hello, I'm Dr. Butt! And I'm going to take your temperature—
Gumball: Aw, please don't be a butt, please don't be a butt, please don't be a butt. Ah, thank you universe. [Sees that the thing he touched is Dr. Butt, a butt-headed guy and shivers]