Zenzou Inukai is a senior member of the Yamainu Squad military special unit. He possesses a massive frame, standing 210 cm tall and weighing 160 kg, with a bald head, green eyes, and blood type O. Born on January 1, he is 51 years old.

In combat, Inukai relies solely on his formidable physical strength, preferring to fight with his fists over weapons. Off-duty, this imposing figure reveals a gentler side, particularly showing concern for younger squad members and offering them guidance drawn from his extensive experience.

He hails from one of the families historically charged with combating the Orochi, a lineage that makes him a potential vessel for the entity. Due to his age and significant stature difference compared to colleagues, he is frequently seen alongside the older squad member Shi, often carrying Shi on his shoulder.