Yamato Yoshio is a villager in the community of protagonist Yamato Takeru and serves as Takeru's father. He opposes his son's discovery and use of the bio-mechanical entity Susanoo, which he and fellow villagers perceive as a dangerous ill omen. This disapproval fuels tensions that culminate in Takeru's departure from the village. Yamato Yoshio's character remains defined by this initial stance as a concerned parent and community member.