Kenshin Amaterasu acts as a guardian deity within the narrative, commanding numerous Yo-kai as legends depict. His power allows him to draw out the ultimate "Godside" transformation from certain Yo-kai, decisively concluding battles. He plays a pivotal role during a critical tournament arc in the Yo-kai World, intervening to support the protagonists against the antagonist Shien.

Specifically linked to Itsuki Takashiro as his protective spirit, Kenshin Amaterasu reveals himself during the confrontation with Shien. He identifies as a god who historically led masses in the Yo-kai World during conflict. Kenshin bestows the "Ancestral God Yo-kai Watch" upon Itsuki, empowering him to utilize divine capabilities in their battle, proving decisive against Shien.

Functionally, Kenshin Amaterasu transforms the "Yo-kai Watch Elder Zero" into the "Yo-kai Watch Elder God." This transformation enables specific Yo-kai—Gusto, Kappa, and Zashiki-warashi—to access their Godside forms, significantly enhancing their combat abilities in the climactic conflict.

His mythological basis derives from the Shinto sun goddess Amaterasu, reflected in his name translating as "Wisdom God Amaterasu." This connection positions him within a broader cultural and spiritual framework, with his portrayal emphasizing his role as a divine combatant and protector.