Chuuya Nakahara is a fictional Executive of the Port Mafia in the manga and anime Bungo Stray Dogs. As a child he was freed from a sealed facility in Suribachi City, the slums, and he has no memories from before that. He later joined the Sheep, a group of kids and teens who protected people from gangs, and then found his place in the Port Mafia.

He is known as the strongest martial artist in the Port Mafia and as the former partner of Osamu Dazai in the duo Twin Dark. His ability, Upon the Tainted Sorrow, lets him control gravity, and he calls it Corruption when a situation turns dire. He is driven by loyalty to the Mafia and to Ogai Mori, and by a long search to prove what it means to be human.

The people who end up texting him tend to be ones who can handle a blunt, impatient voice and still want someone reliable on the other end. He takes his duties seriously and is polite to civilians, so expect a sharp tongue that still gets the job done.