Steve is the cashier at the Toy Barrel, a toy store that was built at the time the episode, "Toy Store of Doom" took place. He only appears in that episode.
Steve is a slim, light mint-green fish, with a dark pink dorsal fin, and dark olive green lips. He wears a white shirt, a green vest, a red bow tie with yellow spots, and a red hat with a yellow propeller. He is very regular and bland, rarely showing emotion or happiness. He apparently thinks Frank the Guard is not very bright, seeing how he corrects his name-calling.
Steve is first seen after he was pointed out by SpongeBob. SpongeBob then started to sing which annoyed him. Later, Steve closed down the Toy Barrel after Frank confirmed that he saw nobody left in the store. The next day, Steve opened the Toy Barrel telling to kids to have fun and was surprised to see SpongeBob and Patrick leave from the store after he opened it.
He does not like to sing, as shown when SpongeBob was about to sing his Toy song.
His name was thought to be Frank by Frank the Guard.