TV-Series
Description
Chūya Nakahara has blue eyes and orange hair, featuring a longer strand cascading past his left shoulder. His signature attire includes a black hat with a brown hatband and thin silver chain, a black choker, and a black ribbon bolo tie secured by a silver buckle. He layers a white button-up shirt under a grey vest and an open black cropped jacket with rolled sleeves. He completes the look with black slacks, a belt hanging loosely off his right hip, black shoes, and almost always wears black gloves. A long black coat with light lining is worn cape-style over everything. In his youth, he favored a black leather jacket with quilted shoulders over a red t-shirt and hoodie, black pants featuring a sheep-logo belt buckle, brown loafers, and a sheep-engraved bracelet.

Chūya originated from a government laboratory incident involving the ability singularity Arahabaki. At age seven, he merged with Arahabaki during a calamity that destroyed the facility and formed Suribachi City. He possesses no memories prior to this event, recalling only a hand freeing him from the seal containing Arahabaki. This fusion suggests he may be an artificial human or modified clone designed to contain the entity, biologically indistinguishable from humans but leaving him with profound identity struggles. He questioned his humanity, citing a lack of dreams, emotional detachment in fights, and uncertainty about whether his personality was innate or programmed.

Around age eight, he joined the Sheep, a youth self-defense group in Suribachi City. As their strongest member wielding the gravity-manipulation ability "Upon the Tainted Sorrow," he defended the group against gangs and expanded their territory. Though not the formal leader, he bore deep responsibility for their safety. At fifteen, the Sheep faced Port Mafia attacks after Arahabaki destroyed a mafia armory. Investigating this, Chūya confronted Port Mafia members Osamu Dazai and Ryūrō Hirotsu. Port Mafia boss Ōgai Mori later coerced him into joining by taking Sheep members hostage and forcing a partnership with Dazai to investigate Arahabaki.

During this investigation, Chūya encountered Arthur Rimbaud. Rimbaud's ability "Illuminations" triggered Chūya's memories of the laboratory incident, revealing Chūya was merely a vessel for Arahabaki, not the entity itself. After a battle, Rimbaud's dying words urged Chūya to live as a human. Shortly after, the Sheep betrayed Chūya, allying with the GSS to stab him. He survived but was exiled. Dazai then offered him a place in the Port Mafia, revealing he orchestrated the betrayal. Chūya accepted, receiving Rimbaud's hat as an entry gift and documents partially explaining his origins as a government experiment.

One year later, at sixteen, he faced assassin Paul Verlaine, who claimed to be his "brother" from the same artificial-human project. Verlaine massacred Chūya's friends to provoke his power. This confrontation culminated in Chūya using "Corruption," a destructive state accessed by reciting a phrase from Nakahara Chūya's poem "Sheep Song": "Oh Grantors of Dark Disgrace. Do Not Wake Me Again." Corruption unleashes uncontrollable gravity manipulation, causing bleeding from every orifice and risking death if not nullified. Dazai nullified it post-battle, saving Chūya. Verlaine’s defeat resolved lingering questions about Chūya's creation.

As a Port Mafia executive, Chūya demonstrates fierce loyalty, prioritizing the organization's interests. He exhibits a temperamental and arrogant surface personality, reveling in combat and ridiculing opponents, but operates with underlying reasonableness. He refrains from unnecessary brutality, honors debts, and shows care for subordinates. His intense hatred for Dazai stems from Dazai's manipulation of the Sheep and constant mockery, though he minimally trusts Dazai's tactics. He struggles with low alcohol tolerance due to physiological weaknesses and smokes rarely when stressed.

In later events, Chūya appeared as a vampire during Dazai and Fyodor Dostoyevsky's prison conflict. This was a deception orchestrated by Mori; Chūya used contacts and fake fangs to infiltrate and aid Dazai while appearing as one of Bram Stoker's vampires.

His literary namesake, poet Chūya Nakahara, influenced his ability names: "Upon the Tainted Sorrow" references a Nakahara poem about hopelessness, while Corruption's activation phrase derives from "Sheep Song".