Dazai.

For 14 years, Dazai teetered between life and death (at his own request). After an unexpected rescue (by Oda himself), he was accepted into the Port Mafia, led by Ogai Mori. He soon became the youngest member of the Executive Committee in the history of the mafia and was considered its right-hand man. Dazai was renowned for his brutal torture methods, mentored Ryunosuke Akutagawa, and developed surveillance tactics within the mafia. Together with Chuya Nakahara, they formed the "Double Black" duo—the most feared of Yokohama's scum. He would soon leave the port mafia following the death of his close friend, Sakunosuke Oda, who was killed during a conflict with the Mimic organization. Realizing that his boss had deliberately sent Oda on a suicide mission, Dazai heeded his friend's final request—to become a "good man."

Dazai has a cocky and cheerful character, but is also self-sufficient. Beneath his seemingly carefree and comedic demeanor, Dazai is extremely cunning, intelligent, and mysterious. He possesses a keen intellect, a cunning bordering on genius, and an ability to predict people's actions. He can devise complex, multi-move combinations based on the smallest details. Dazai's keen observation skills allow him to solve complex cases and decipher his opponents' plans. In battle, he maintains his composure even in the most tense situations.

Dazai is a slender young man, approximately 18 years old. He has short, slightly wavy dark brown hair, light brown eyes, and fair skin. He wears a simple, formal suit. His body is wrapped in bandages—the result of wounds sustained in battle.