The coach is a muscular fish with a white shirt, blue shorts, and a blue hat. He is light olive green with a light orange dorsal fin and carries a silver whistle.
He only appears in the episode "Sing a Song of Patrick," during Patrick's flashback. He appears while young Patrick was reciting his poem and the coach angrily claimed that it was gym class before Patrick was pelted with dodge balls. He later appears at the end of the episode and claims that Patrick needs another lesson. He, along with a crowd get their dodge balls ready and start pelting Patrick with the balls.