- Voice Actor (CV)
- Ryoutarou Okiayu
- Gender
- Male
- Age
- 17-24 (human), 480+ (demon)
- Role
- Supporting
- Identity
- The highest-ranking member of the Twelve Kizuki as Upper Rank One, the most powerful demon serving under Muzan Kibutsuji, and a former Demon Slayer swordsman of the Sengoku era
Personality
Composed and calm
Strictly disciplined
Highly prideful
Relentless pursuit of perfection
Kokushibo stands at the apex of the Twelve Kizuki under the title of Upper Rank One, commanding overwhelming authority with his six-eyed visage. Born as Michikatsu Tsugikuni, he once served as a Demon Slayer swordsman during the Sengoku period, but eventually transformed into a demon in pursuit of eternal life and the ultimate pinnacle of swordsmanship. He appears during the gathering of the Upper Ranks in the Swordsmith Village arc, demonstrating a rigid sense of hierarchy and immense power, and is regarded as Muzan's most trusted subordinate.
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