Paco is a fish that has appeared in several episodes.
He first appears in the episode, "Pickles," where he is debuted in a brief cameo along with other fish worried about Bubble Bass.
Paco is a green and light blue fish with a spiky fin. He wears a purple shirt with a white lab coat and gray pants. He has four dark blue spots on his head.
In "New Student Starfish," it is revealed that he is a student in Mrs. Puff's Boating School and has three stars on the Good Noodle Board.
In "Goo Goo Gas," he is seen working as a price tagger.
In "Le Big Switch," he appears to be a French chef trying to cook soup, but Mr. Le Schnook tells him it's terrible.
His name may be a reference to the fish known as Pacu, a type of omnivorous piranha.