The fish with eaten butt appears to be a middle-aged fish who is yellow-beige in color. He wears an orange shirt, light brown shoes, and blue pants that are bitten off (hence his name).
Role in episode
The fish with eaten butt is first seen after many customers in the Krusty Krab are mentioning the things the Alaskan Bull Worm ate. When the fish is seen, he only comments "Do I need to say it?" Later in the episode, the Fish with Eaten Butt is seen working on his car and having his butt bandaged up. Unfortunately for him, the Alaskan Bull Worm passes by while he is chasing SpongeBob and Sandy and takes another bite out of the fish's butt. He replies "Not again!" and is not seen again in the episode after that.