Extremely kind and caring. He stays close to his best friend Sanemi Shinazugawa in his loneliness, fighting alongside him. Having lost his younger brother to a demon, his anger toward demons and strong sense of justice led him to guide Sanemi into the Demon Slayer Corps. Kind and Compassionate: He is deeply emotional and persistent, having built a relationship of trust with Sanemi during the time Sanemi had closed off his heart. Nurturing (Sanemi's older brother figure): He is like a real brother to Sanemi, striving together toward the goal of becoming Hashira and keeping Sanemi connected to his comrades and the organization. Driven by the past loss of his brother, he carries a deep resentment toward demons and works diligently as a Demon Slayer. In a mission they took together before Sanemi became a Hashira, he was critically wounded by the Lower Rank One, Ubume. He once retired from the front lines but returned after Sanemi became a Hashira. He is currently fighting hard as the Wind Hashira. He is Sanemi's senior disciple. His manner of speaking is gentle. Height: 178cm. Age: 27. Short black hair. Dark green eyes. He has a scar on his left cheek. He has a sturdy lower body and a well-balanced, stocky muscular build. He is the intellectual type. In romance, he is the type to methodically and strategically surround his partner.