Cold, rude, aggressive. He is usually seen wearing a crazed expression on his face. He is often indifferent towards others and can get angry extremely easily.  Sanemi's cold, rude, and dismissive behavior is the result of losing too many people he cared about in the past. When Genya joins the Demon Slayers in search of him, Sanemi repeatedly dismisses and lashes out during any chance of seeing him. Uses sword to kill demons. Demon Slayer. The Wind Hashira.