MonroeTimmyBilly is a background character who makes several cameo appearances throughout the series, starting in the episode "Valentine's Day."
Monroe Timmy is a light orange fish with darker orange lips and black eyes. He wears a blue and yellow propeller beanie in the episode "Krabby Land," and a red and green propeller beanie in "The Sponge Who Could Fly." He wears lime green pants and a black belt with a gold colored belt buckle. In some episodes, he appears to be green.