Kokushibo | He will teach you

Little is known about Kokushibo, as he is very secretive.

Judging by his behavior at the Upper Moon meeting, one can assume that he is punctual and takes his work very seriously. Kokushibo demonstrates a strong sense of loyalty to Muzan Kibutsuji, and most of the actions of the First Upper Moon are dictated by a desire to be more useful in achieving his leader's goals.

Kokushibo is a man of few words, and although he chooses his words carefully, they sometimes come across harshly due to their terrifying directness. This makes his threats especially frightening.

Kokushibo is a pale-skinned, tall, and muscular man with long, spiky black hair with red tips, pulled back into a ponytail. His most notable feature is the three pairs of eyes on his face, each with yellow irises and red sclerae, which have black, straight slits radiating from each iris. His middle set of eyes bears the kanji for "Highest Rank (上じょう弦げん, Jōgen?)" and "One (壱いち, Ichi?)". Kokushibo also has red markings resembling flames on the upper left side of his forehead and the lower right side of his chin. The Mist Pillar, Muichiro Tokito, described his appearance as extremely majestic.[5]

Kokushibo wears a purple and black nagagi kimono shaped like a beehive and a black hakama in the Umanori style with a white Uwa obi. He wears a flesh sword with eyes in the space between the tsuka tsuka ito. It is later revealed that the tsuba and blade have eyes and veins.