Charlie is a tuna fish that usually appears in the Krusty Krab as a customer.
He is a light blue and turquoise fish that wears red-orange shorts and makes regular cameos at the Krusty Krab. He has blue lips, blue arms and legs, and a blue fin. He usually appears as a citizen or simply a Krusty Krab customer. He is voiced by Dee Bradley Baker. A bikini-wearing version appears alongside him in the episode, "SpongeGuard on Duty." That version also appears in the episode, "Extreme Spots."
He seems to be fond of Krabby Patties since he is a regular customer at the Krusty Krab. He also seems to be fond of magic because in the episode, "Hocus Pocus," he stars in a magic kit commercial and really seems to enjoy the product. Although, he may have been paid to act that way so that people (like SpongeBob) would buy the product.