Inui 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. He is very committed to the Black Dragon and loyal to Hajime Kokonoi, who he considers his best friend. When he finds people he trusts, he devotes himself to them. As the former 10th Generation leader of the Black Dragon, Inupi had control over a massive army of strong delinquents. Later, as he becomes Taiju's assistant, he still has authority on the gang.