Billy is a light yellow fish, with blue eyes. He wears a wavy purple bonnet and a white diaper. He also sucks a pale-red pacifier.
Role in series
"Goo Goo Gas"
Billy is seen with Incidental 45 at Barg'N-Mart, sitting in a shopping cart while his mother shops. He is later insulted by Plankton, which causes Incidental 45 to run over Plankton with her shopping cart twice.
He is with Incidental 47.
Incidental 45 holds him during the riot. He appears again later in the episode when Incidental 45 tells him to look at Squidward while he is dancing in a monkey costume.
He is with Incidental 7.
He is with Incidental 14.