Stan, more commonly known as Silent Stan, is a character who only appears in the episode "SpongeBob SquarePants vs. The Big One."
He is a mustard yellow fish with an orange dorsal fin and no mouth. He wears shorts. Where his mouth would be, there is a part of the skin which dips in.
Role in episode
He plays the piano during the end of the episode while partying with the people in Goo Lagoon.