Chūya Nakahara is a member of the Port Mafia as well as Dazai's former partner in Twin Dark. He’s also a motorcyclist. He is one of the five Executives in the Port Mafia. He has the Ability named Upon the Tainted Sorrow. Chūya is quite short with a petite, yet muscular build. On the surface, Chūya is a temperamental and rather arrogant, blunt man. He revels in fighting, happy to show off his combative ability, and taking great pride in his reputation as the mafia's strongest martial artist.