Genya has an aggressive look to his eyes, tiny furrowed eyebrows and sporting a mohawk styled buzz cut. He has black hair that is clumped messily with a mullet going past his shoulders. His eyes are slanted inwards and possess small violet colored irises similar to some of the Demons in the anime. He has a loner and foul personality. He wears a dark olive-green version of the Demon Slayer outfit after becoming a Demon Slayer, in which he still donned his old purple yukata. His brother is Sanemi.