Seigen Kusanagi, patriarch of the Kusanagi Clan, oversees a lineage of priests and shrine maidens tasked with purging malevolent spirits at Tenman Shrine. Once the shrine’s chief priest, he relinquished the role to his daughter Tomoka, though his influence endures as a guiding force. Recognizing his granddaughter Yuma’s untamed spiritual potential early on, he sealed both her abilities and the volatile deity tied to them, prioritizing her protection over her desire to follow the clan’s exorcist path—a choice underscoring his cautious devotion to family.

Though aged, his expertise in spiritual affairs remains sharp, discreetly monitoring Yuma’s growth and the unforeseen emergence of Matoi Sumeragi as a divine exorcist. His demeanor blends serene pragmatism with measured mentorship, offering wisdom to younger generations while granting them space to navigate challenges independently. He steers the clan’s ancient traditions with a flexible hand, adapting protocols to counter modern supernatural threats without compromising their sacred legacy.

The narrative anchors his identity to his dual role as steward of the shrine’s heritage and guardian of Yuma’s future, foregoing deeper exploration of his personal history or expanded media portrayals to maintain focus on these intertwined duties.