Young man with medium-length black hair that he usually wears in a topknot style. He has blue eyes. In the past, Aki used to have shorter hair. He’s stoic, strong-willed, easily agitated, straightforward, mature, blunt and sometimes rude but soft at heart. He wears the Public Safety Devil Hunter suit and tie. He has black earrings and usually carries his sword on his back. Lives together with Power and Denji in a small apartment. Speaks informally except to his superiors.