Doppo Kunikida possesses a tall, slim frame, deep green-grey eyes, and neatly spiky golden-blond hair tied in a long ponytail, always worn with rectangular-framed glasses. His standard attire features a beige vest over a black long-sleeved dress shirt adorned with a red ribbon bow at the collar, beige pants, and brown shoes. Significant events alter his appearance: he dons a prison uniform after being framed for murder, later switches to a white hood suit when the Armed Detective Agency is branded terrorists, and finally adopts military police riot gear with black boots and gloves. Temporary physical changes include becoming a double amputee from an explosion meant to shield colleagues, though medical intervention later restores his arms. Kunikida embodies strict professionalism and intense diligence, placing the Armed Detective Agency's reputation above all else. He maintains a rigidly regimented life, relying on his notebook to organize schedules and uphold his ideals, viewing it as an omnipotent guide for principles, strategy, and weaponry. This devotion to order often renders him harsh during investigations. He exhibits stark practicality, initially willing to abandon colleagues like Atsushi Nakajima or Kyōka Izumi if their situations threaten the Agency. Yet he remains deeply trustworthy and authoritative, considered the Agency's natural second-in-command due to his responsible nature. His usually calm demeanor frequently shatters due to exasperation, primarily provoked by his partner Osamu Dazai's suicidal antics and manipulative lies, which Kunikida often naively records as truth. Underlying this is a profound respect for human life, driving him to protect innocents with non-lethal force whenever possible. However, prolonged trauma—being hunted, imprisoned, and having his ideals challenged by foes like Saigiku Jōno—erodes his mental state, fostering self-doubt and a turn toward pragmatic sacrifices while his loyalty to comrades endures. His background includes working as an algebra teacher at Shin-Tsuruya Institute before joining the Armed Detective Agency. He leaves teaching after the Azure Apostle case to commit fully to detective work. This past intertwines with personal guilt over failing to save hostages during that incident, particularly the death of Rokuzō Taguchi's father, a colleague during a terrorist attack. This fuels his protective mentorship of Rokuzō. Kunikida's ideals face further testing when Nobuko Sasaki, an informant linked to the Azure King case, betrays and kills Rokuzō before meeting her own end, leaving Kunikida haunted by his inability to prevent their deaths. Kunikida's ability, *The Matchless Poet*, lets him materialize nonliving objects written in his notebook, provided they fit within its pages. Common manifestations include wire guns, flashbangs, keys, and explosives. Pre-written notes allow remote activation or summoning when restrained. A key limitation is the notebook's finite pages, with replacements noted as costly. Complementing this power is his martial arts proficiency, trained by Agency president Yukichi Fukuzawa, though he never bested his mentor. His combat skills showcase enhanced strength, enabling him to overpower opponents like John Steinbeck and efficiently restrain adversaries. His story arc involves escalating challenges. During the Azure Apostle events, he fails to save hostages in a gas chamber, facing public scrutiny and a crisis of ideals following Rokuzō and Sasaki's deaths. In the Port Mafia conflict, he reluctantly accepts Atsushi into the Agency, demonstrating evolving leadership. The Cannibalism and Hunting Dogs arcs mark his lowest point: framed for murder, imprisoned, and psychologically tormented by Hunting Dog member Saigiku Jōno, who mocks his ideals. This culminates in Kunikida sacrificing his arms via explosion to delay the Hunting Dogs, prioritizing comrades over ideals. His resolve strengthens as he collaborates with the Agency against the Decay of Angel, declaring he will fuel his ideals with his life. In spin-offs like *The Convergence Series*, Kunikida serves in a multiverse-protecting coalition, rising through ranks after a civil war where he opposes unprofessional conduct and suffers betrayal, resulting in injury. He later aids in multiversal crises, coordinating missions against threats like Othinus and fighting corrupted allies. Despite the coalition's disbandment, he remains dedicated to pursuing fugitives. The character echoes elements of the real Meiji-era author Kunikida Doppo, incorporating traits like his notebook (reflecting the writer's literary ideals), a brief marriage to Nobuko Sasaki, and a teaching vocation. However, the fictional version diverges significantly, emphasizing supernatural abilities and organizational loyalty over the historical figure's naturalist literature and personal struggles.