Billy has a light pink-colored shell like Gary, but is lighter and glossy, and on his shell, there are no dots, just red lines like Gary's, but much thinner. He has green skin with a blue underside, styled black hair, and blue eyes. He has a brown leash and appears to be more sophisticated than most snails.
After Billy comes back from going for a walk with Brad, he meets Mary. Billy became her new boyfriend, which makes Gary and Mary's ex-boyfriend very sad.
When he says "meow," instead of saying it like most snails, his meow sounds like a man's.