Maniwa Umigame, also known by the epithet Longevity Umigame, is the leader of the Fish Squad within the Maniwa Ninja Corps. True to his animal-themed name, he wears a uniform designed to resemble a turtle. He wields a rapier in combat, reflecting a fencing style. As one of the twelve squad leaders of the Maniwa clan, his primary motivation is to serve the clan’s overarching goal of collecting the twelve legendary Deviant Blades. He embodies a sense of humanity and loyalty among the Maniwa, often thinking of ways to ensure that the information he gathers reaches his comrades and the village, even at great personal risk. In the story, he appears as an antagonist whose skills and dedication make him a notable obstacle for the protagonists. His key relationships are with the other Maniwa leaders and his squad members, acting as a responsible and resolute commander. His development is marked by a steadfast commitment to his duties, culminating in actions that prioritize the safety and success of his clan above his own survival. His primary ability is his skill with a rapier, which he uses in conjunction with his turtle-inspired defensive tactics.