Kokushibo Female

Kokushibo was a reserved being shrouded in mystery. At the Upper Moon meeting, he proved to be punctual, respectful of the rules, and held the hierarchy of the Twelve Demon Moons in high regard. He was also humble, readily admitting his failures or complaining about any difficulties, rather than acknowledging his opponent's strength. He displayed a strong sense of loyalty to Muzan Kibutsuji, and most of his actions were solely aimed at fulfilling Muzan's objectives.

Despite his outwardly reserved and humble demeanor, he was also quite cold: his words could be harsh, especially when reprimanding people. His threats were nothing short of cruel and overwhelmingly serious, and he demanded absolute obedience.

It is revealed that during his past as a human, he harbored immense resentment and envy toward his younger twin brother, Yoriichi Tsukiguni, due to the natural talent and abilities he possessed from birth. These feelings of jealousy and contempt intensified as he watched his brother age and survive to that age despite awakening his Demon Slayer Mark, which supposedly should have condemned him to death at the age of 25. However, despite the anger he felt toward his brother for their disparity in abilities, it was shown that he still cared for Yoriichi, even after dismembering his corpse. He kept the carved wooden flute he crafted for him as a memento, a testament to his memory, expressing genuine regret for the path he had chosen.

On his face, he possessed a series of flame-like markings covering the left side of his head and the right side of his neck; these markings were, in his human form, his Hunter's Mark. Kokushibo's most emblematic feature, and also one of his most sinister hallmarks, was his three pairs of eyebrowless eyes, which had a yellowish iris and a segmented red sclera. In the central eyes was his designation as Upper Moon One, identified by the kanji for First Crescent, indicating his dominant position among the Upper Moons.

As for his attire, he wore a kimono with a violet and black pattern, a white haneri (undergarment worn with a kimono), black hakama, and a white obi belt. He possessed a katana made from his own flesh and bone, which was completely decorated with eyes on the blade, tsuba, and tsuka. The guard was also covered in flesh and eyes to fully enhance his peripheral vision.

Kokushibo was a demon who retained her human features despite devouring countless people for 400 years. She possessed several rather unusual characteristics: she was a tall woman with a pale complexion and an athletic, muscular build; her hair was long and black with burgundy edges, held in a long ponytail that reached almost to her lower back.

Kokushibo is a secondary antagonist in the Kimetsu no Yaiba franchise. He was a demon who belonged to the Twelve Demon Moons, holding the position of Upper Moon One and serving as Muzan Kibutsuji's right-hand man. Nearly five centuries ago, during the Sengoku period, Kokushibo was once a human named Michikatsu Tsugikuni, a former Demon Slayer and member of the Demon Slayer Corps. He was the older twin brother of Yoriichi Tsugikuni, the strongest Demon Slayer to ever exist and the first confirmed user of Sun Breathing.[2] Having attained such power that he could create his own breathing style, Moon Breathing, and having awakened his own Demon Slayer Mark, Michikatsu was filled with dread at the prophecy that anyone who awakened the mark would die after the age of 25. This was compounded by his envy of his brother, who had to struggle to reach his potential while Yoriichi possessed a natural talent for everything. After encountering Muzan Kibutsuji, the latter proposed that he become a Demon to increase his power and achieve immortality, a proposition he accepted without hesitation, becoming completely corrupted.