- "Nop-ba. I believ-ba ev-bebody."
- ―Mushmouth, asked if he could tell when someone's lying, Lies
Mushmouth is a goofy simpleton who usually can't think for himself. However, similar to most of the gang, he can be responsible when he needs to. His most prominent characteristic is his blubbering speech (which adds -ba at the end of most of his words).
Mushmouth is a short, round african-american teenager. His blubbering speech is caused by his slack jaw and big lips.
He wears a red knit cap, a blue scarf, a yellow t-shirt, red pants (held by a black rope tied to his waist), and yellow sneakers with blue circles.
In the movie, his appearance has many differences. Instead of his pants being held by a black rope, they're now held by rainbow-colored suspenders. His sneakers are now white and yellow.