Bobby

Bobby was the replacement Billy that Grim and Mandy found online. He tried to steal Billy's life from him, but failed and went to an unknown dimension that Billy made to get rid of Bobby so that Billy could have his life back.

Appearance
Bobby almost looks like Billy but his skin is a yellow-like color, has freckles, normal eyes, black hair is shown, and has three spots on his nose which is a different shade of pink. Also, unlike Billy, his nostrils are visible.

Bobby