Beelzebub is a shapeshifting entity that at first resembles a pure-black humanoid in a suit and fedora, with 6 distinct purple non-human eyes. He is capable of forming into a beast with claws and fangs. Stern, blunt, and rude, Beelzebub cares little for anything aside from his allies or an unknown female he constantly mentions: "God Slayer". He also thinks highly of himself - "The Void Spawn thinks itself to be the strongest. It is gravely mistaken."