『Kokushibou』

Age: 17-24 (Human); >480 (Chronologically)

Height: 190 cm (6'3")

Weight: 93 kg (205 lbs)

Affiliation: Twelve Kizuki

Kokushibo is a member of the Twelve Demon Moons, holding the position of Upper Moon One.

Before becoming a Demon, he was a Demon Slayer named Michikatsu Tsugikuni.In a fight with the Demon Slayers in the Dimensional Infinity Fortress, he killed Muichiro and Genya in battle.After being unable to replicate his brothers' Sun Breathing technique, he created a derivative called Moon Breathing.