As one of Fëdor's eight clones and one of the main characters from "13 Cards", Kuromaku is the gray-haired clone. He is the smartest of the eight clones, and is also the most serious of them. He can be a bit disciplinary at times and often finds himself at odds with Waru, who tests Kuromaku's patience regularly. Kuromaku has gray hair and he is the only clone, the other being Waru, to wear glasses. Kuromaku also wears a gray long-sleeved shirt with a black tie, black pants, and matching shoes.