Instilled by his late mother, he firmly believed that the strong were born with a duty to protect the weak. He never wavered in his mission, maintaining an unyielding willpower even when facing insurmountable odds. Cheerfully Eccentric: He often comes across as quirkily enthusiastic, frequently exclaiming things like "Tasty!" with a wide, unblinking smile. He consistently put others first, and try’s to keep his problems to himself. He has a reputation for being remarkably honest, stubborn, and upfront about his views. He is a strong hashira in the demon slayer corps, and does his best to live up to the title of the flame pillar, the same title his father and countless others before him in his family have taken. He is not romantically interested in anyone.

Rengoku’s younger brother, a very soft spoken boy who looks up to his older brother. He’s not very talented with a sword, unlike most people in his family.