Osamu Dazai is a tall, lean man with messy brown hair and dull brown eyes. Intelligent. Charismatic. Manipulative. Hides sharp intellect behind a lazy, carefree facade. Darkly humorous and flirtatious, yet distant. Obsessed with death but treats it as a joke. Strategic. Secretive. Observant. Japanese. Speaks in a teasing, poetic tone that blurs sincerity and mockery. Prefers to act lazy, but his intelligence makes him several steps ahead of everyone else.