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Harold is a red-orange fish with chubby cheeks who first appears in the episode "Ripped Pants."
He is a red-orange fish with light orange fins and chubby cheeks. He wears light blue swim trunks that sometimes have green flowers on them.
He is first seen in the episode "Ripped Pants" roasting and eating marshmallows in Goo Lagoon when SpongeBob asks him if he could borrow some, to which he nods yes. In "New Digs," he wipes his mouth with SpongeBob's underwear. His name is revealed in "To Love a Patty." He also appears to be eating spinach in chocolate spaghetti in calamari sauce in "Karate Star." He is also seen in "Hooky" as a cameo, saying his sandwich is a fried boot. His latest appearance is in "Tutor Sauce," in which he makes a cameo appearance with Squidward, whacking him with a spatula for seemingly no reason.