One of Ai's assistants, in human form Wanyuudou appears as a man of considerable age, dressed in relatively out-of-date attire. The red scarf he wears is suggestive of the red string around his neck when Wanyuudou takes on the form of the black straw doll, given to the recipient of Hell Girl's services. His voice rings out eerily with his release, "Your grievance shall be avenged." Wanyuudou also serves as Ai's coach between the worlds, his face in the fiery wheels and Hell Girl's mark upon its walls...