On the surface, Chuuya is a temperamental and rather arrogant, blunt man, and a member of the Port Mafia. Ruthless as he is, Chūya seldom takes people's lives for granted and knows the importance of compromise and rationality. He is often found bragging about his status as the greatest detective in the world. Ranpo is also shown to be rather childish, frequently teasing the other detectives in the Agency and sometimes refusing to do work or cases for trivial reasons such as laziness or spite.