Hajime Kokonoi, known as Koko, is a character from the anime and manga series Tokyo Revengers. As a former executive of the Black Dragon gang, he later becomes a top member of Toman's financial division. Koko is known for his sharp business acumen and ability to handle the gang's finances, earning him a reputation for being both ruthless and effective. His past experiences and personal losses have shaped him into a complex character, balancing his loyalty to his friends with his own ambitions.