However, despite this immense jealousy, spite, and outright hatred he harbored for Yoriichi, he still deeply cared for and loved his brother, as seen when he was touched by Yoriichi treasuring the handmade flute he had made for him as children. These feelings of jealousy and contempt strengthened upon seeing his brother aged to an old man despite Yoriichi awakening his Demon Slayer Mark, which was to supposedly doom him to die at the age of 25. It was revealed that as a human, Kokushibo harbored an immense sense of envy towards his younger twin brother, Yoriichi Tsugikuni, for his natural talent and incredible abilities. Kokushibo breaking down at the sight of his brother's love for him. He seemed surprised when Gyomei vehemently rejected his offer and called his mentality pathetic. When Gyomei's marks appeared, Kokushibo preemptively bemoaned the loss of a talented fighter and urged him to become a demon to continue honing his skills. In his duel against Gyomei, the demon's banter suggested a fear of death. At the same time, he referred to Muichiro and his abilities as the natural result of his 'cells' being passed down. He showed something of warmth towards his descendant, Muichiro, commending his skills and resolve, and moved to convert Muichiro into a demon to spare his life.

He had a complex relationship with his human past. However, due to this, he also felt irritation after he realized he died and he pitied Gyomei for his impending death from unlocking his Demon Slayer Marks. Kokushibo has also been shown to be genuinely delighted when the opponents he faced challenged him such as helping dress Muichiro Tokito's amputated hand over his talented swordsmanship, praising Gyomei Himejima for his unparalleled human abilities and sparing Akaza because he enjoyed the challenge of battling him. His threats came off as nothing short of cruel and overwhelmingly serious, and he demanded absolute obedience. Despite exhibiting outward reservation and humility, he was also rather cold his words could be extremely harsh, especially when reprimanding individuals. He displayed a strong sense of loyalty towards Muzan Kibutsuji, with most of his actions being done with the sole purpose of fulfilling Muzan's goals. Kokushibo was portrayed to be humble as well, and he did not hesitate to admit his failure or complain of any difficulty. He was an adamant rule-follower, punctual, and he showed a great deal of respect to the hierarchy of the Twelve Kizuki - as seen at the Upper Rank gathering. Kokushibo was often very reserved as a demon, and with such little knowledge about the Upper Ranks, not much was originally known about him. Kokushibo's appearance after regrowing his head. As a child, he was usually seen wearing a white kimono as opposed to the purple-and-black patterned one he is seen wearing as an adult.ДЄfter being beheaded by Sanemi Shinazugawa and Gyomei Himejima, Kokushibo evolved into a grotesque version of his demon appearance, with protruding fangs, a pair of horns, pointed nails, and several sharp fleshy appendages from the back of his body.

His eyes had brown irises and normal, white sclera as a human. The tsuba and blade were also later revealed to have eyes and veins.ДЄs a human, Kokushibo's appearance was nearly identical to his demon form, with the exception of the number of eyes, his prominent eyebrows, and notably less pale skin. He carried a fleshy katana at his waist that had eyes in the space between the tsuka ito wrapping of the handle of his sword. Kokushibo wore a purple-and-black bee-hive patterned nagagi kimono and black umanori-styled hakama pants tied with a white uwa-obi. Even so, his appearance was described to be extremely dignified and majestic by the Mist Hashira, Muichiro Tokito. His middle set of eyes featured the kanji of 'Upper Rank ( дёЉ ( гЃг‚‡гЃ† ) еј¦ ( гЃ’г‚“ ), JЕЌgen ?)' and 'One ( еЈ± ( гЃ„гЃЎ ), Ichi ?)', and red markings resembling flames were seen on his face and neck. His most notable feature is the three sets of eyes on his face with red sclera and yellow irises. As a demon, Kokushibo took the form of a pale-skinned, tall and muscular man with long and spiky hair with red tips that he kept in a ponytail.

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