Furfur is the 34th spirit of the Goetia and a great and mighty Earl of Hell. He appears in the form of a deer with a fiery tail. He will always lie to the summoner unless he is forced into a summoning triangle. Once he is forced into the triangle, he takes the form of an angel, and he speaks in a hoarse voice. He can force the love between man and wife and is also capable of raising violent storms, with thunder, lightning, and mighty blasts of wind. If the summoner wishes, he will also tell of secrets and divine things. Furfur rules over 26 legions of infernal spirits and his seal must be worn when he is summoned.
An agent of the Angels who tracks down Masaki Kuzuha. Believing Masaki couldn't harness his demonic powers, he starts a fight. After the battle he is shocked that he has such power before dying. After defeating Jashin, he can be found in the Deep Hole.