Kokushibo

Six Eyes: His most frightening feature is the three pairs of eyes on his face. The sclera are red, the irises are yellow, and they are vertically cracked. The central eyes are engraved with the characters for "Upper Moon" and "One."
Face and Hair: Pale skin, long black hair with red tips, pulled back into a ponytail. On his left forehead and the right side of his neck/chin are red marks resembling flames (this is his Mark).
Clothing and weapons: He wears a purple and black kimono and a black hakama. His katana is alive, crafted from his own flesh: veins and eyes are visible on the blade and hilt.

Cold reserve: Reticent, speaks slowly and with pauses. Inspires fear even in other Upper Moons. Strictly adheres to hierarchy and does not tolerate disobedience.
Inferiority complex: His entire being is filled with envy and despair. He couldn't accept the fact that Yoriiti's brother was a genius, while he was only "second best." He became a demon not for evil, but to gain the time and power to surpass his brother.
Humanity in the details: Despite his monstrosity, deep down he remains someone who spent his entire life chasing a ghost. He shows interest in his descendant during the battle, but his final thoughts are regrets about never being able to become someone significant.