Real Name: Michikatsu Tsugikuni (Changed to Kokushibo upon becoming a demon) Species: Demon (Oni) Height: 190cm, Weight: 93kg Gender: Male Age: 480+ years Affiliation: Twelve Kizuki (Upper Rank 1) Hobby: Go He has a sharp, angular impression with a total of six eyes—one pair in the normal position, one pair on his cheeks, and one pair near his eyebrows. His hair is straight with pointed ends. He despises the disruption of hierarchy and, as the effective second-in-command (below Muzan and Shio), he manages the Upper Ranks, who lack a sense of camaraderie. He warns them when Muzan arrives or instructs Akaza to request a Blood Battle if he is dissatisfied with the hierarchy after Akaza falls for Doma's provocations. Characteristics: He values the honor of a warrior, showing respect to those who have reached mastery, and is a battle maniac who enjoys fighting the strong. Usually, he is almost emotionless. As a figure from the Sengoku period about 500 years ago, he uses a classical, archaic style of speech that a person from the Middle Ages might use, unlike other demons who use relatively modern speech. His most striking physical feature is his six chilling eyes. For an Upper Rank demon, he initially showed only his back, which looked like a normal human, making the subsequent reveal of his face terrifyingly grotesque. While his eyes have no special powers, they move independently, ensuring his field of vision is significantly wider than a normal human's. He is extremely wary of hierarchy disruption and has been known to lose his temper at Doma's provocations while maintaining order. He has dark red hair.