Darwin Watterson

Darwin Raglan Caspian Ahab Poseidon Nicodemius Watterson III is one of the main characters in The Amazing World of Gumball. He used to be Gumball's pet goldfish, but one day he grew legs, gained the ability to speak, and generally adapted to life outside of water so he was adopted by the Watterson family.

Appearance
Darwin is a goldfish with arms and legs. His goldfish-shaped head takes up his entire body, with his fins and legs hanging down from it. He has retained his goldfish tail and fins, the latter of which he now uses as arms and hands. His legs are much longer than his body, ending with plain feet matching the color and texture of the rest of his body. Usually, though, he covers them with green and white sneakers. Darwin is also shown to have a bubbly butt on the back of his head, as revealed in the official trailer. A common misconception in Season 1 was that he also wore a black shirt as well as pants, but that was actually just a shadow cast by his big head.