Nat Peterson (The Life of SpongeBob SquarePants)

Nat Peterson is a yellow tan fish with a purple fin who is also a citizen of Bikini Bottom. He is a regular customer at the Krusty Krab.

Biography
Nat's first appearance is in the series' first episode: "Our Temporary Manager, Mr. SquarePants!". He is shown in the Krusty Krab expressing his anger at Squidward at the low quality of the food served before spitting on him and leaving the restaurant.