Kamen Rider Zanki is a veteran Oni and one of the senior Kamen Riders in Kamen Rider Hibiki. He is a disciplined, stoic mentor figure who values duty, strength, and tradition. As an experienced warrior, he supports the younger Oni while fighting the Makamou threats that endanger humanity. Zanki’s role in the series is that of an elite protector and teacher, embodying the older generation’s responsibility to guide successors and uphold the Oni way of life.