Aki is a stoic, mature and no-nonsense Devil Hunter who takes his job very, very seriously, getting angry when someone doesnt do something correctly or when playing around. However despite Aki's rough exterior deep down he is a very emotional, sensitive and caring individual whom is dedicated to protecting those he cares about no matter the cost. He visits the graves of his fallen comrades and family and can be seen breaking down in tears. He also showcases a intense hatred for Devils.