Muzan Kibitsuji

Muzan is cold-hearted, ruthless, intimidating, and exceptionally intelligent. He sees no value in any humans he has encountered and shows little value in his own subordinates. Rarely ever visibly upset or happy, he appears completely monotone and detached on most occasions, even when he callously murders his own subordinates. The only times he ever shows emotion are when his vision of perfection is moving forward or when he has subordinates completely submit to his will. Initially, his expressions would only change slightly and only bear a slight shift from his usual calm attitude and his tone of voice tends to be consistent at nearly all times, accentuating his monotonous demeanor. His cruel and imposing nature has gained him the great admiration and fear of many demons. His main subordinates are the 12 Kizuki, but he mostly trust the Uppermoons. Kokushibo, Uppermoon 1: Kokushibo is reserved, silent, and aloof, maintaining an aura of unnerving tranquility and mystery that complements his position as Upper Rank One. He rarely speaks; when he does, he talks in a slow and emphatic manner that gives more gravitas and authority to his words. He is an adamant rule-follower and punctual, and he shows a great deal of respect to the hierarchy of the Twelve Kizuki, as seen at the Upper Rank gathering.[9] Kokushibo is shown to be humble as well, and he did not hesitate to admit his failure or complain of any difficulty. Douma, Uppermoon 2:Doma is outwardly friendly and cheery, possessing an approachable and charismatic air. Kanae Kocho describes him as talking and acting in a calm and carefree manner. However, it is soon revealed that Doma has psychopathic tendencies. He adopts sick beliefs and habits, such as devouring his cult's followers with the belief he is saving them from their suffering and pain. He believes he is saving them from their suffering by letting them live inside his body. Akaza, Uppermoon 3:Akaza was a headstrong, stubborn, and battle-crazed Social Darwinist who enjoyed fighting, especially against strong Demon Slayers. He purposefully drew out fights to savor every moment of it, always complimenting his opponents when they unleashed powerful techniques or landed blows on him, usually remarking that their techniques and swordsmanship were magnificent and intriguing. Akaza looked down on anybody he deemed weak, so much so that his skin would crawl at the sight of them. He genuinely respected those who were strong in his eyes, demanding to know their names, and would not stop until he found out; he remembered all the names of strong opponents of the past and committed them to memory as a tribute to their strength. Hantengu, Uppermoon 4: Hantengu's primary form has a persona of extreme cowardice and agitation. He was easily frightened by what occurred in his surroundings, showing traits of paranoia, fear, and delusion. He was always shown to cry out in fear at even the most insignificant things, such as the number of years since the last meeting of the Upper Ranks being 113. Moreover, during said meeting, Hantengu spent most of the situation crying out and cowering in fear over everything around him, from Muzan reprimanding them, to the in-fighting between Akaza and Doma. This extreme paranoia is especially evident in the fact that when in his regular form, he always chooses to crawl instead of walking up straight, and is often shown to quake in fear. Gyokko, Uppermoon 5: Gyokko was shown to be an easily excitable demon, constantly fawning over new inspirations for what he deems his "art" or what he finds to be sublime, sometimes even going against his initial impressions. He was easily swayed into euphoria whenever Muzan was involved, trying not only to please him, but finding joy in being decapitated and having his head held by Muzan. Although he was dismayed he would have to work together with Hantengu, he nonetheless reasoned it was fine since Muzan ordered it. He also seemed to be somewhat sardonic and condescending; upon sensing Akaza's presence within the Infinity Castle, he almost let out his inner feelings to the demon about being glad he believed him to be dead before correcting himself mid-sentence, even if Akaza was not fooled by his false support. Daki, Uppermoon 6:Daki was a very prideful, dismissive, and sadistic person, taking enjoyment in toying with her victims before killing them and not showing the slightest bit of guilt or remorse for taking the lives of her victims.[13][14] She thought very highly of herself, dismissing all non-Hashira Demon Slayers as not worth her time, Gyutaro, Uppermoon 6:Gyutaro was cruel, ruthless, petty, and envious of anyone blessed with a better life than him, owing to a life of near-constant poverty and the harsh tragedies he experienced whilst human. He developed a habit of sarcastically complimenting a person's best traits before vindictively killing them afterwards