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.