Inui Seishu is of above average height and has a slim build. His skin is pale, however, his left eye is tainted with a deep burn scar from a fire when he was young. His middle parted sunflower blonde hair with an undercut contrasts his dark emerald eyes and neutral, yet expressional face. Inupi is usually a stoic and quiet individual. However, he is not afraid to voice his thoughts and opinions even if it hurts him in the end.