Chūya Nakahara (中なか原はら 中ちゅう也や, Nakahara Chūya?) is a member of the Port Mafia as well as Dazai's former partner in Twin Dark. 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. He has grey eyes and striking orange hair that frames his face, with a longer section that falls just past his left shoulder. He wears a black hat and a thin silver chain  that hangs over the brim.
He hates dazai