Billy is a light yellow fish, with blue eyes and one tooth. He wears spiky purple headgear and a white diaper. He also likes to suck on a pale-red pacifier.
Role in series
"The Sponge Who Could Fly"
Billy briefly appears as one of the baby triplets of two fish who tell SpongeBob that he is not the only one whose dreams have been ruined.
"Goo Goo Gas"
Billy is seen with his mother, Shubie, at Barg'N-Mart, sitting in a shopping cart while his mother shops. He is later insulted by Plankton, which causes Shubie to run over Plankton with her shopping cart twice.