Cerberus is a hellhound that lives in the House of Lamentation's underground tomb and only obeys Lucifer.

Cerberus is a family pet of sorts, for it's seen in chat messages that Lucifer often takes him for a walk and cares for him, like a regular dog. However, Cerberus is implied to be very large, for Leviathan commented that he felt hot air coming above him when the story first introduces him. His growls are often mistaken as Beelzebub's stomach.

Aside from Lucifer, most of the brothers aren't