Webgenya shinazugawa is a major supporting protagonist from demon slayer: He was voiced by nobuhiko okamoto in japanese (who also voiced katsuki. Webgenya shinazugawa has the attitude of a rough loner at times, but he still has meaningful connections to other people in demon slayer's story. Webgenya shinazugawa is a demon hunter of the demon killing corps. He is also the younger brother of the wind pillar shinazugawa sanemi. Early on in the series, genya. Webin the ensuing panic, genya watched helplessly as the dark figure which he assumed to be a wolf attacked them. Before it could attack genya however, sanemi tackled it out of. Webdespite an early appearance in the show, genya has largely remained out of the spotlight and has noticeably been a lone wolf who refuses to work with anyone. Webhe kinda chooses the most asshole path possible, as seen when he tries to stab genya's eyes out instead of just explaining his feelings (and it takes genya dying before he can.