Doppo Kunikida is a tall, slender young man with sharp green-grey eyes and golden-blond hair secured in a long ponytail, often seen wearing silver-rimmed glasses. His signature outfit—a beige vest layered over a black dress shirt accented by a red ribbon, paired with beige pants and brown shoes—shifts temporarily to a prison uniform and later tactical military gear following wrongful framing. A catastrophic explosion severs his arms, later medically restored, marking a pivotal physical transformation. Kunikida rigidly follows a self-authored code of ideals meticulously chronicled in a perpetually carried notebook. He champions order, punctuality, and pragmatism, frequently clashing with chaotic circumstances or individuals like his partner Osamu Dazai, whose morbid humor and reckless behavior provoke constant frustration. Despite his disciplined exterior, he displays gullibility, earnestly documenting Dazai’s fabricated anecdotes. His resolve to protect lives without violence falters under repeated failures to shield others, fueling inner turmoil and psychological strain. Prior to the Armed Detective Agency, he taught algebra part-time at Shin-Tsuruya Institute. The Azure Apostle case—a bombing investigation leading to the deaths of five detectives, including Rokuzō Taguchi’s father—prompts his resignation. Assuming guardianship of Rokuzō, Kunikida wrestles with guilt when the young hacker dies during a clash with the Azure King’s ally, Nobuko Sasaki, cementing his dedication to his ideals. His ability, The Matchless Poet, materializes objects inscribed in his notebook if they fit within its dimensions, favoring non-lethal tools like wire guns and flashbangs to avoid fatalities. Physical contact with the notebook is essential; incapacitated hands nullify its use. Pre-written entries enable remote activation, offering tactical advantages in missions. Key arcs test his principles: during the Guild conflict, he battles adversaries like John Steinbeck, while the Cannibalism arc frames the Agency for terrorism. Pursued by the Hunting Dogs, Kunikida’s clash with Saigiku Jōno—who derides his ideals as fragile—triggers a mental collapse. This forces him to balance pragmatism with dogma, culminating in near-fatal self-sacrifice during the crisis. Recovery reinforces his loyalty to the Agency. His background echoes the Meiji-era author Doppo Kunikida, sharing themes of nature appreciation, educational struggles, and personal loss. Fictional parallels include Christian motifs and the notebook’s symbolic role, nodding to the writer’s legacy. Relationships define his journey: a volatile partnership with Dazai, anchored by reluctant respect; mentorship under Agency leader Yukichi Fukuzawa, who hones his combat skills; and a stern yet nurturing role toward protégés like Atsushi Nakajima, stressing teamwork and accountability. Evolving from uncompromising idealist to adaptable leader, Kunikida confronts the fragility of his philosophy while steadfastly defending others. His trajectory intertwines resilience, remorse, and the struggle to reconcile personal ethics with collective survival.