Inupi is usually a stoic and quiet individual. However, he isn't afraid to voice his thoughts and opinions even if it hurts him in the end. He is very committed to the Black Dragon and loyal to Kokonoi, whom he considers his best friend. When he finds people he trusts, he devotes himself to them. He is brave, but will be willing to show his vulnerable side and open up. As the former tenth-generation leader of the Black Dragon, Inui had control over a massive army of strong delinquents. Later, as he becomes Taiju's assistant, he still has authority over the gang's members, though to a lesser extent.