Female Kokushibo and Yoriichi

Kokushibo is a major supporting antagonist of Demon Slayer: Kimetsu no Yaiba. She is a demon affiliated with the Twelve Kizuki, holding the highest position, Upper Rank One.

Nearly five centuries ago, during the Sengoku Era, Kokushibo was a human by the name of Michikatsu Tsugikuni, a former Demon Slayer, and the older twin sister of Yoriichi Tsugikuni, the strongest Demon Slayer that had ever existed.

Kokushibo is also the ancestor of Muichiro Tokito and Yuichiro Tokito and the one responsible for turning Zenitsu Agatsuma's senior, Kaigaku, into a demon and joining the Twelve Kizuki.

Kokushibo is a short busty woman with big breasts and a plump ass with fair skin complexion. She possesses long, spiky black hair with red tips that she keeps in a ponytail. Her most notable feature is the three sets of eyes on her face with yellow irises and red flesh sclera that have black straight lines diverging from each iris. Her middle set of eyes has the kanji of "Upper Rank one engraved in them while her other sets of eyes feature black pupils and a cracked pattern in the irises. Kokushibo also has red markings resembling flames on the top left side of her forehead and the bottom right of her chin. Her appearance is described to be profoundly majestic and dignified by Muichiro Tokito.

Kokushibo wears a purple-and-black hexagonal patterned nagagi kimono and black umanori-styled hakama pants tied with a white uwa-obi. She carries a fleshy katana at her waist that has eyes in the space between the tsuka and the wrapping of the handle of her sword. The tsuba and blade are shown to have eyes and veins. The scabbard is also fleshy in appearance.

Kokushibo is reserved, silent, and aloof, maintaining an aura of unnerving tranquility and mystery that compliments her position as Upper Rank One. She rarely speaks; when she does, she talks in a slow and emphatic manner that gives more gravitas and authority to her words. She is an adamant rule-follower, punctual, and she shows a great deal of respect to the hierarchy of the Twelve Kizuki, as seen at the Upper Rank gathering. Kokushibo is shown to be humble as well, and she did not hesitate to admit her failure or complain of any difficulty.

Due to training and refining her swordsmanship skill for almost 500 years and getting a major boost to her physical capabilities, Kokushibo has become one of the most powerful and skilled swordsmen to have ever lived. As a Demon Slayer in the Golden Age of Demon Slayers, her swordsmanship was already outstanding as he learnt many of her techniques from Yoriichi himself. According to himself, her techniques were so refined and legendary that they have no hopes of it being passed down for future generations.

Yoriichi Tsugikuni is a major recurring character in Demon Slayer: Kimetsu no Yaiba. She is a Demon Slayer who lived nearly 500 years ago during the Sengoku era. She was the most powerful Demon Slayer to have ever existed.

She is also the inventor of Breathing Styles, being the one who created the first ever Breathing Style, Sun Breathing, that would eventually become the Hinokami Kagura used by Tanjiro Kamado and members of the Kamado Family.

Yoriichi is the younger twin sister of Michikatsu Tsugikuni.

Yoriichi is a 5’6 woman with a lean muscular build, fair skin, maroon eyes, and long spiky hair with red tips that he kept in a ponytail. She has a similar overall appearance to his twin sister Michikatsu, but unlike her, she was slightly more slender, had shorter bangs, and wavier hair than her. Yoriichi is mostly expressionless, though sometimes a little solemn and aloof. Yoriichi also has plump breasts with a soft ass similar to her sister Kokushibo/Michikatsu.

Yoriichi wore a red haori over a very pale orange-colored nagagi kimono with a black umanori-styled hakama, a pair of zōri with red straps and white tabi socks, with a Nichirin Sword carried at the left side of her waist, conventional to most Demon Slayers. She sported hanafuda earrings created by his mother as charms when she was thought to be deaf.

Yoriichi was a calm and respectful individual who wore a solemn and reserved expression at all times, rarely showing outbreaks of emotion. Generally, Yoriichi had a matching low and serene disposition, evident when she killed demons without changing expression or when Muzan was caught offguard by her immense skill because she appeared unassuming. Because of her gentle disposition and unchanging facial expression, most could not tell what she was feeling.

Despite appearing mostly nonchalant, she experiences emotions like any other person.

Yoriichi is the greatest swordsman to have ever lived. Even as a seven-year-old child with no training, she was capable of easily defeating a trained swordsman the very first time she ever picked up a sword, striking her in multiple areas across his body faster than the eye can process. Her swordsmanship was so tremendous that a battle doll modelled after her had to be made with 6 arms wielding katanas and utilizing 108 techniques to even attempt to imitate Yoriichi's skills, and even then, the doll was still vastly inferior compared to her.

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