He wears a white T-shirt and blue shorts and has tannish-green skin and dark green fins. For the rest of the episode of his first appearance though (after the scene at Stinky Burgers), he was shown with olive, brown skin, dark green eyes, and light yellow fins.
When first introduced, he was a schoolmate of Mr. Krabs and Plankton at Poseidon Elementary. He was also one of various friends of the school bully, Billy, who teased and tormented Eugene and Plankton as children. According to his friends, he will eat anything. He was the first to try Plankton's chum burger, but when he ate it, he spit it out.