Age: 15 (past), 27 (future), 18 (final arc)

Birthdate: April 1, 1990

Blood type: A

Height: 174cm (5'9")

Weight: 60 kg

Hair color: black

Eye color: black

Hajime Kokonoi, known as Koko, is the former 10th generation Black Dragon commander.

Koko 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 himself but will turn his back on them the moment they lose their instrumentality.

Although materialistic in nature, his inclination toward monetary gain is rooted in despair. When Akane Inui, the girl he liked was 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 forgot his original objective.

(Source: Tokyo Revengers Wiki, edited)