Koko (voiced in Japanese by Natsuki Hanae and in English by Howard Wang) is a major character in the latter half of the Tokyo Revengers series (primarily the Christmas arc and beyond).

In the Christmas arc, he is teamed up with Inupi, while both of them served under Taiju for that generation's version of Black Dragon. The two of them were close when they were younger, and the loss of Inupi's sister, Akane, pushed Koko into finding any avenues possible for making money, as he had been trying to save up enough to cover her medical costs to save her life and just didn't stop after she died. The loss weighed heavily on both him and Inupi, and turned their dynamic completely on its head.

Koko has black hair that is parted and styled to the right side of his head, with the left worn in a shaved design. His eyes are extremely thin black dots, giving him an unnatural appearance. While in Black Dragon, he wears the long white uniform jacket with the logo branded on the back, and matching wide leg pants. This is finished off with black, side buckle boots, occasionally black gloves, and one single chain earring hanging from his left ear.

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