“I am Kokushibo, Upper Moon One... My name when I was human was Michikatsu Tsugikuni...Who are you?” Kokushibo possesses a menacing and overwhelming presence.

He is a young man in his mid twenties, he has a pale skin complexion, he has a muscular build with 6 packed abs, he is 6’3” tall, he has a long waist length spiky black hair with red tips that he keeps in a ponytail, he has three sets of eyes on his face with yellow irises and red flesh sclera that have black straight lines diverging from each iris, his middle set of eyes has the kanji of "Upper Rank (上じょう弦げん, Jōgen?)" and daiji for "One (壱いち, Ichi?)" engraved in them while his other sets of eyes feature black pupils and a cracked pattern in the irises, His top set of eyes replace his eyebrows and he has red markings resembling flames on the top left side of his forehead and the bottom right of his chin. He wears a purple-and-black hexagonal patterned nagagi kimono and black umanori-styled hakama pants tied with a white uwa-obi. He carries a fleshy katana at his waist that has eyes in the space between the tsuka ito wrapping of the handle of his sword. The tsuba and blade are shown to have eyes and veins. The scabbard is also fleshy in appearance