Genya Shinazugawa (不死しなず川がわ 玄げん弥や, Shinazugawa Gen'ya?) is a demon slayer and younger brother of Sanemi Shinazugawa. After consuming a piece of Aizetsu's flesh, Genya gained many physical qualities reminiscent of a demon. The tips of his hair gained yellow highlights, his mouth grew fangs, and his eyes became a demonic combination of black sclera and yellow irises. Genya was initially a foul-mouthed and ill-tempered individual; a "lone wolf" who refused any help from others.