Hairo

thumb|Hairo brags about his knowledge of torture. Hairo was sadistic, vengeful, and ruthless. He did not care for the numerous innocent lives in Tokyo, or that of the Demon Slayers assigned to find him, only focuses on his revenge against the Flame Hashira who tormented him. Hairo was also a skilled torturer, recalling in his holding of Mitsuri that he knew the human limits when under extreme pain and he planned to use his experience to torture her before he would kill the young Demon Slayer. Most of all, his anger towards Shinjuro Rengoku essentially controlled who he was and blinded him from seeing that the Demon Slayer facing him was not the same man from the past but his son. Such was his fear of Shinjuro that Hairo believed that his entire life was dictated by anger and fear since that day, even remarking that he might die of sheer indignation. He had a habit of shooting himself in the head or mouth to alleviate his tension and anger when faced with a stressful situation. In his battle with Shinjuro's son Kyojuro, Hairo was initially motivated by his false belief that he was facing Shinjuro; upon realizing he was mistaken, he seemingly lost most of his rage and motivation for revenge. Additionally, despite his proficiency in using guns, Hairo seemed to despise them, as during his last confrontation with Kyojuro, the demon wielded a katana to face him after running out of ammunition. In that moment, Hairo showed pride in his swordsmanship and demanded the Demon Slayer duel him and be allowed to kill him with a blade. In his final moments, Hairo even acknowledged that Kyojuro's swordsmanship surpassed his own.

Hairo was a relatively tall young man with an athletic build. He had very spiky black hair with two chin-length bangs. As a member of the Twelve Kizuki, he had the kanji for |Ka}} and the daiji for |Ni}} etched on his left eye. Hairo also had many black spike-like patterns framing his face. He wears an Western-style light colored suit with a black buckled belt with saggy pants and black boots. Over this, he wears a black cloak similar in appearance to a cape with protruding collars. Finally he wears a white sailor hat with a wolf emblem on its front center. He was frequently seen wielding a revolver.

Overall Abilities
As the holder of the second highest position among the Lower Ranks of the Twelve Kizuki, Hairo is a very powerful demon. Armed with his Blood Demon Art, marksmanship, and swordsmanship skills, he is an extremely formidable foe. He was able to stand his ground against Kyojuro Rengoku, dealing great damage to the Demon Slayer and nearly killing him multiple times, despite Kyojuro being ranked as a Kinoe at the time, which is the highest non-Hashira rank of the Demon Slayer Corps. Hairo was also able to immediately subdue Mitsuri Kanroji, though she was a relatively inexperienced Demon Slayer at the time. The Lower Rank put up an extremely good fight against Kyojuro, evidently pushing the latter to his limit as he collapsed after the battle, only being defeated when the Demon Slayer unleashed his Ninth Form: Rengoku technique. Skilled Torturer: As stated by Hairo himself, when he was human, he was extremely experienced in torturing people using a variety of methods. Hairo instinctively knew when someone was about to hit their breaking point as long as they are alive. He even has the mindset of someone who enjoys inflicting pain and suffering on others.