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Coach is Patrick's former physical education teacher. He only appeared in the episode Sing a Song of Patrick, during Patrick's flashback. He randomly appeared while Patrick was reciting his poem, the coach angrily claimed that it was gym class before Patrick was pelted with dodge balls. Technically, "Coach" isn't his name, but all known about him is that he is a coach.
The coach is a muscular fish with a white tee-shirt, blue shorts, and a blue hat. He is green and carries a whistle.