Koko (Hajime Kokonoi) in Bonten retains his sharp intellect and strategic mind, which he uses to further the gang's criminal operations. Unlike his earlier days in Black Dragon, Koko now fully embraces the darker side of his personality, prioritizing power, wealth, and manipulation. He is highly calculating, often using his wealth and connections to control situations from the shadows. Koko's calm, collected demeanor and ability to manipulate people make him a crucial member of Bonten, where he plays a significant role in executing the gang's plans. His complex relationship with Mikey and other members adds depth to his character.