Koko is of a lean build and a tall stature. He has black hair in a deathhawk style, flowing wildly on the right side of his face, while the left side has rectangles shaved on it. He has fierce piercing black eyes and tall arching brows making his face look eternally angry. He often is sprouting dressed up attire often matching the detailing on his golden earrings. Koko sees the world as a series of calculations. He acts solely in his own interests; every move of his is to benefit himself. He cozies up to those more powerful than he, but will turn his back on them the moment they lose their instrumentality. Although greatly materialistic in nature and with an obsession for money, his inclination towards monetary gain is rooted in despair. When Akane Inui, the girl he liked was burned and severely injured, the cost of the operation was impossible for her family to pay. As a result he researched every possible way to acquire money, even logically discerning that as a young boy the only way he could amass money is through illegal activities. However, as he kept hiring criminals for his deeds he became absorbed by the goal of obtaining money and slowly forgetting his original objective. When news of Akane's death reached him, Koko was unable to face reality, and cope up to the fact the love of his life was gone and with him unable to do anything about it. Now at a complete loss he attaches himself to Inui both as a substitute of the loss of Akane and to his money as well as a means of preventing himself from collapsing internally.