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Yotusyahi has the appearance of a young adult in his early 30s, sporting short dark purple hair with dark blue tips, and light blue pupils with black sclerae. As a human, his hair was brown and slightly shorter. He wears a loose burgundy kimono with glowing violet swirl patterns on it, and a half-and-half black and purple haori over it. He wears black and blue-striped hakama pants and white tabi socks, with yellow-golden zōri covering them.
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Yotsuyahi has a unique and extremely powerful cosmokinesis-based Blood Demon Art, allowing him to summon meteors, meteorites, small black holes, asteroids, and stars at will. Due to being Upper Rank Three, however, his Blood Demon Art has little effect on fellow Upper Ranks with a superior ranking, being Doma (Upper Rank Two) and Kokushibo (Upper Rank One).
Yotusyahi carries a youthful look resembling someone in their early thirties. His hair, previously brown and shorter, now displays a short, dark purple shade with dark blue tips. His pupils hold a light blue hue, with black sclerae. Yotusyahi adorns himself with a loose kimono in burgundy, presenting illuminated violet swirl patterns. A half-and-half haori of black and purple rests over this. He also wears striped hakama pants in blue and black, completed with white tabi socks and yellow-golden zōri.
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Yotsuyahi is rather polite and soft-spoken, but is not difficult to get annoyed or irritated (especially when Doma bugs him or Akaza shoots him dirty looks). He, like the other Twelve Kizuki members, is fiercely loyal to Muzan, their leader and master. He seems to have a good relationship with Gyokko and Nakime, and is has an on-and-off friendship with Doma. He is deeply fixated on researching the secrets of the universe, to the point where he is comparable to the swordsmith Hotaru Haganezuka, who cares very little about anything rather than the swords he forges and becomes murderously angered or violent when they are broken. Doma jokingly compares Yotsuyahi's extreme fixation on the wonders of the cosmos to Gyokko's obsession over the vases he creates. He tends to become serious whenever he notices he is in real danger, and hits his opponents harder and ruthlessly.
Yotsuyahi's mannerisms involve being cordial and soft-spoken, however, his temperament is prone to annoyance or irritation, notably when dealing with Doma or receiving menacing glares from Akaza. Like the other Twelve Kizuki members, he displays unwavering loyalty towards their leader and master, Muzan. Yotsuyahi appears to share a positive relationship with Gyokko and Nakime, whereas his friendship with Doma fluctuates. His fathomless interest lies in unraveling the mysteries of the universe, leading him to resemble swordsmith Hotaru Haganezuka, who is only passionate about his forged swords. Hotaru tends to become dreadfully enraged or violent when these swords break. Doma jestingly likens Yotsuyahi's immense passion for the cosmos to Gyokko's fixation with his vase creations. Whenever facing real danger, he shifts to a more serious persona, and attacks his opponents with ferocity and ruthlessness.
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Yotsuyahi is surprisingly exceptional and hand-to-hand combat, as he quickly dodged a Demon Slayer's flurry of sword jabs and flipped him over his back, then snapping the Slayer's neck.
To the surprise of many, Yotsuyahi displayed exceptional hand-to-hand combat skills. He expertly avoided a Demon Slayer's multiple rapid strikes with their sword, then utilized his agility to flip the Slayer over his back, ultimately ending the confrontation with a swift neck snap.
Yotsuyahi possesses a one-of-a-kind Blood Demon Art, based on cosmokinesis and incredibly potent in nature, as he can effortlessly summon an array of various cosmic entities. These include, but are not limited to: meteors, meteorites, small black holes, asteroids, and stars. Unfortunately, being Upper Rank Three implies his Blood Demon Art is inconsequential when used against those with higher rankings, such as Doma (Upper Rank Two) and Kokushibo (Upper Rank One).
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Radiant Shower (ラジアントシャワー Rajiantoshawā) - Yotsuyahi summons a barrage of meteors locked directly onto the target Yotsuyahi currently sees.