Chūya Nakahara serves as a high-ranking executive within the Port Mafia. He possesses a slim, muscular build, stands 160 cm tall, and has distinctive orange hair with a longer section framing the left side of his face. His eyes appear grey or blue depending on the adaptation. He frequently wears a black hat with a chain accessory, a black choker, gloves, and a long black coat draped over his shoulders. Born on April 29, his early life remains largely unknown due to the absence of memories prior to age seven. At that age, he became merged with Arahabaki, an energy-based singularity representing calamity, during a catastrophic event at a government facility. This incident, triggered by European spy Arthur Rimbaud's failed attempt to steal Arahabaki, resulted in the creation of Suribachi City's ruins. Rescued from the facility by an unknown hand, Chūya grew up unaware of his origins. Around age eight, he joined the youth self-defense group, the Sheep, serving as their primary protector through his gravity-manipulating ability. Though not their formal leader, he felt deep responsibility for their safety. At fifteen, following a Port Mafia attack on the Sheep, Chūya investigated rumors linking the incident to Arahabaki. This led him into conflict with Port Mafia members Osamu Dazai and Ryūrō Hirotsu. Port Mafia boss Ōgai Mori subsequently coerced Chūya into cooperation by taking Sheep members hostage and forcing a partnership with Dazai. During their joint investigation into Arahabaki, they encountered Arthur Rimbaud (disguised as the sub-executive Randō), who revealed Chūya's role as the vessel containing Arahabaki. After Rimbaud's defeat and death, the Sheep, manipulated by Dazai and fearing Chūya's abandonment, betrayed him and allied with the GSS. Stabbed by former comrade Shirase, Chūya fled. Dazai then offered him membership in the Port Mafia to spare the Sheep's lives, an offer Chūya accepted after recognizing Dazai's orchestration of the betrayal. As part of his initiation, Mori gifted him Rimbaud's hat and withheld documents detailing his origins as leverage for loyalty. Chūya exhibits a temperamental, arrogant, and blunt personality, particularly around Dazai, whom he intensely dislikes due to their history of manipulation and conflict. He readily engages in combat, takes pride in his martial prowess, and often mocks opponents during fights. Despite this, he demonstrates pragmatism, disengaging from unnecessary battles when strategic negotiations arise. He operates with a mission-first mentality, employing lethal force when required but showing disgust at gratuitous violence. He possesses a strong moral code regarding loyalty and debt repayment, refusing to harm those he owes even if they are adversaries. Deep-seated insecurities about his humanity stem from his connection to Arahabaki, his inability to dream, and later investigations suggesting he might be a modified clone of the original Chūya Nakahara, artificially created to house Arahabaki. This ambiguity caused significant identity struggles during his youth. He adopted a personal philosophy of restraint, preferring kicks over punches and refusing to remove his gloves in combat, believing doing so would signify a loss of enjoyment in the fight and a need for genuine self-preservation – emotions he feared his perceived inhumanity prevented him from feeling. Rimbaud's final words urging him to live as a human and subsequent experiences gradually led him to value his existence regardless of his origins. Chūya wields the ability "Upon the Tainted Sorrow," granting him control over gravity and gravitons. He manipulates gravity's direction and intensity on objects or people he touches or within his environment, enabling flight, walking on walls, deflecting bullets, shattering concrete with enhanced strikes, and creating localized craters. His martial arts skills, considered the best in the Port Mafia, complement this ability. His ability has a secondary state called "Corruption," activated by the phrase: "O, Grantors of Dark Disgrace, Do Not Wake Me Again." This form drastically amplifies his power, allowing feats like crushing tanks and generating pseudo-black holes, but at the cost of his sanity and physical integrity. Overwhelmed by destructive impulses, he laughs maniacally while indiscriminately attacking everything around him, unable to deactivate it himself. Corruption causes severe physical deterioration, including bleeding from multiple orifices, and will eventually kill him unless nullified by an ability like Dazai's "No Longer Human." His loyalty is a defining trait, transferring from the Sheep to the Port Mafia after joining. He prioritizes the organization's interests, advocating for eliminating threats like the dangerous ability user Q after they killed his subordinates, despite orders to capture them alive. This loyalty extends to repaying debts, such as refraining from antagonizing Ango Sakaguchi until a favor is returned. He maintains a sense of responsibility towards those under his command. Across various story arcs, Chūya fulfills critical Port Mafia roles. He confronts the Armed Detective Agency during conflicts like the Guild's incursion, demonstrating his combat prowess. During the "DEAD APPLE" incident, he utilized Corruption to combat the destructive fog entity. In later manga arcs, he participated in a plan to free Dazai from prison, disguising himself as a vampire with red contact lenses and artificial fangs to infiltrate Fyodor Dostoevsky's forces. Further exploration of his past occurs in the "Storm Bringer" light novel, where he confronts Paul Verlaine (Rimbaud's former partner and his own "brother" figure as a fellow artificial being). Verlaine's manipulation and the massacre of Chūya's associates, the Flags, intensified his trauma and solidified his resolve within the Port Mafia. This storyline delves deeper into the experiments surrounding his creation and the lingering question of whether he is the original or a clone, a question Chūya ultimately decides is irrelevant to his chosen life.