Bubble, as his name suggests, is a large, round bubble with sharp teeth constantly displaying a vacant expression. Being a bubble, most of his body is shiny and semi-transparent. His eyes are black dots. When it is necessary, Bubble can form a long, reddish-silver tongue. With his mouth is closed, his teeth are still faintly outlined. When in the scene of the feast, Bubble dons a white chef hat and a spatula and knife. His pupils are capable of enlarging. Like his boss Caine, he is an AI.