Gunther Fitz or as referred to in the episode "Mrs. Puff, You're Fired," Mr. Fitz, is an orange fish. He is in the Board of Boating, whom has control of Mrs. Puff, and her boating school.
He is a light orange fish with a dark orange dorsal fin, and a black mustache. He wears a lime green shirt with a purple tie and green pants.
He comes to see how Mrs. Puff's boating school is running, and he witnesses one of SpongeBob's failings, and also was in a sequence of crashed with Sergeant Sam Roderick and SpongeBob.
Fitz appears on the TV in the life insurance commercial, telling SpongeBob about life insurance. SpongeBob then signs two contracts Gunther offers through the TV screen.