Gumball is a light blue cat with six total wiskers (but only five are visible). He wears a beige colored sweater with a field drab colored neckline and cuffs, he also wears dark grey pants with cream trimmings. His appearance looks similiar to his mom. He is a little chubby around his waist.
In RC's depiction at 13, Gumball has shaggy maroon (chestnut, brown-red) hair. His new attire consist in a light grey sweater and dark blue jeans. He has a birthmark shaped as a eight-pointed star on his right ear.
Gumball is a trouble-prone cat who is some-what upbeat. As shown in The DVD, he can be very overeactive. He usually gets in trouble because of his crazy shinanigans. He is some-what polite, as shown in The Ghost, because he will do whatever someone asks him to do until he gets fed-up with it. Gumball's antics sometimes keeps him from learning some key lessons of life.
- Gumball is one of the 3 characters who have appeared in every episode.
- As shown in The Quest, Gumball can't catch many things thrown at him.
- His nickname (later legal name) is based on the food and candy "Gumball".
- Gumball is the only male between the Watterson Quadruples.
- Gumball is one of the few characters who break the fourth wall.
- Gumball has a nano in FussionFall, a game in Cartoon Network. In the game, his dad, The GI, and the game Splash Master are mentioned.
- Gumball has a very imaginative mind, as shown in "The Words" Where he fights Darwin, making the enviorment pixelated, like a old video game, the way that happened seems fairly similar to "Street Fighter".
- In the fanon, he and his family are relatives with the Peterssons, beacuse Robin is Nicole's brother.
- When Gumball freaks out, he yells AHHHHHHHHHHH MEOW.
- He hangs out with MANY girls.
- He also knows how to play an electric guitar, because he was learnt by Martha.
- He is the youngest.