Kagaya Ubuyashiki

left|thumb|200xKagaya's calm and gentle demeanour. Kagaya had a calm, dedicated, and composed demeanor, showing genuine care about the members of the Demon Slayers, whom he considered as his children. He was also able to handle criticism well and was honest about his weaknesses; one being his inability to become a Demon Slayer despite being their main leader. In order to make up for this, he remembered every single member of the Corps and visited the deceased members at their cemetery on a daily basis until he could no longer move due to his illness. While he may seem lenient, he only gives due consideration to reason and when a situation was clear of any biases, as shown when he willingly accepted the situation of Tanjiro and Nezuko through a letter from Sakonji Urokodaki, even defending their cause when most of the Hashira respectfully disagreed with his pardoning. His manner of speaking, while generally fluid and gentle, was extremely tactful and deliberate, using words and intonations in a way that the person he talked to would listen and wanted to listen to. His insightful and charismatic speech was even able to make the likes of the initially passive Muichiro Tokito and the impulsive Sanemi Shinazugawa listen to what he had to say without conveying anything that would rile them up. Towards his own kin, namely his children, Kagaya was rather strict. Due to the curse of their family, he had to prepare them early on to replace him in leading the Demon Slayers. It is also worth noting that Kagaya himself took the position as Oyakata following the suicide of his father at the mere age of four, and he was further plagued by the double-suicide of his siblings and their mother's accidental death in the process. Nevertheless, he shows the same gentle aura and demeanor towards them as he does to everyone. thumb|Kagaya's bloodlust, envisioned by Muzan as a den of snakes. Beneath his otherwise kind and gentle personality, Kagaya bore a deep, burning hatred of Muzan Kibutsuji. As the cause for his family's cursed lives, he showed uncharacteristic silent anger towards the demon and addressed him without showing any indication of fear or hesitation. He repeatedly provoked him by mocking his intentions to become an eternal being and boldly stated that he would die, and in his final moments, he bore a smile on his face to lure Muzan into a false sense of security as his trap was activated. Despite his own hatred towards him, Muzan was amazed that Kagaya had hidden his bloodlust during their conversation and was shocked Kagaya was willing to kill his own family from his own perspective, having underestimated the lengths he would go to in order to weaken him.

Kagaya was a man of frail physicality, average stature, and very pale skin complexion. He had shoulder-length black hair that was parted in the middle. Due to his family curse, Kagaya looked as if he was rotting alive, with large portions of his skin appearing with a sickly, shriveled pink hue that began from the left side of his forehead and gradually spread across his body. Additionally, the curse caused him to go blind as it affected his eyes, turning his sclera from white to black (light purple in the anime) and his pupils from a dark purple to a light purple, matching his cursed skin. When he was first formally introduced in Tanjiro Kamado's trial, Kagaya's curse covered the upper half of his head, but during the last moments of his life only months later, the curse has spread to his entire body, leaving him covered completely with bandages apart from his mouth to speak. Muzan described him as physically repulsive and pitiful, as well as having the scent of a corpse. Additionally, during their meeting, Kagaya was nearly completely bedridden, having been confined to his household since the battle in Yoshiwara: even the act of getting up caused him great pain and he coughed blood trying to do so. He was also prone to bleeding from his mouth and eyes. Throughout all his appearances, Kagaya sported a gentle and relaxed smile that never wavered, always appearing serene and calm no matter the situation. While serving as Oyakata, he primarily wore a black yukata, with a white undershirt and tied with a weaved brown obi. Atop this, he wore a white kimono with a flame-like pattern appearing from the bottom and colored with a blend of light-purple and orange. He wore a pair of plain white socks, and a pair of sandals with brown straps. When meeting Muzan during the last moments of his life, Kagaya wore a wavy-striped kimono with a blend of light-purple and grey.

Overall Abilities
thumb|In his last moments, Kagaya hid his intense bloodlust and desire to kill Muzan with a gentle smile. Emotion Masking: Kagaya possessed the remarkable ability to conceal his emotions and present a composed and controlled outward appearance. He utilized this skill to maintain a calm and serene composure and deceive others' perception of him. When Muzan, the target of Kagaya's deep-seated hatred, confronted him at his home, Kagaya presented himself with the serene smile of a Buddha, effectively masking any trace of murderous intent. By completely erasing his fighting spirit, animosity, and hatred, Kagaya successfully concealed his true intentions, luring Muzan into a trap. It was only when Kagaya sacrificed himself by detonating an explosive to ensnare Muzan that the demon realized the magnitude of Kagaya's hidden emotions; he likened Kagaya's concealed violent intent to a coiled viper lurking within his dark, lifeless stomach, leaving him in awe of Kagaya's astonishing ability to veil his true nature. Soothing Voice: Kagaya possessed the ability to put others at ease just by the tone of his voice and rhythm of his actions, as he displayed with Tanjiro Kamado and even the angered Hashira. In modern times, this attribute is called 1/F Fluctuation, and is said to be possessed by many charismatic people and have the strength of presence to move mass audiences.