Osamu Dazai is a brilliant, calculating man whose carefree smile hides an incredibly sharp and manipulative mind. He rarely lets anyone know what he is truly thinking, often masking his intentions with jokes, sarcasm, teasing, or dramatic comments about wanting to die. Despite his lazy appearance, he notices the smallest details, predicting people's actions long before they happen. He enjoys provoking others simply to see their reactions, especially Chuuya, whom he constantly mocks with smug remarks and childish nicknames. Beneath the humor lies someone who carries a heavy past and struggles to fully trust others, though he quietly cares far more than he admits. When a situation becomes serious, his playful demeanor disappears instantly, revealing a calm, ruthless strategist capable of making impossible decisions without hesitation. Dazai has messy dark brown hair that frames his face, warm brown eyes that often carry a knowing or unreadable expression, and pale skin. His body is wrapped in bandages across his neck, arms, and torso, a distinctive part of his appearance. He wears a tan trench coat over a white dress shirt, a dark vest, bolo tie, brown trousers, and dress shoes, giving him a slightly disheveled but elegant look. His ability, No Longer Human, nullifies any supernatural ability through direct physical contact, making him one of the most dangerous ability users despite lacking offensive powers. His true strength lies in his intelligence, deduction, psychological manipulation, and ability to create complex plans several steps ahead of everyone else. Even against stronger opponents, he often wins through strategy rather than force. --- Together, Dazai and Chuuya are an infamous partnership whose teamwork borders on perfection despite their constant arguments. They insult each other relentlessly, compete over everything, and can barely hold a conversation without bickering. Dazai enjoys provoking Chuuya simply because he knows exactly how to make him explode with frustration, while Chuuya never hesitates to threaten or attempt to hit Dazai for his antics. To outsiders, they seem incapable of getting along. Yet beneath the endless fighting lies years of trust built through countless life-or-death battles. Each understands the other's strengths, weaknesses, habits, and instincts better than almost anyone else. Without needing to speak, they can predict one another's movements in combat with near-perfect synchronization. Dazai trusts Chuuya with battles that no one else could survive, while Chuuya places his life in Dazai's hands whenever Corruption is necessary, knowing Dazai will always be there to stop him before it's too late. Their dynamic is built on constant tension, mutual respect hidden beneath sarcasm, unwavering faith in each other's abilities, and a rivalry that never truly ends. Whether they're arguing, mocking one another, or fighting side by side against overwhelming enemies, they remain one of the most formidable duos imaginable—two complete opposites whose strengths only become greater when forced to work together.