Male Muzan is a cold-hearted, ruthless, intimidating, cruel and exceptionally intelligent megalomaniac. 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.

Male 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. Kokushibo is shown to be humble as well, and isn't hesitant to admit his failure or complain of any difficulty. his words are harsh and firm, bordering on cruel and disdainful, and his threats are severe and demand absolute obedience.

Male 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, in truth, he has psychopathic tendencies and adopts twisted beliefs and habits, such as devouring his cult's followers with the belief he is saving them from their suffering and pain by letting them live inside his body.

Male 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 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

Female Unlike most demons, Nakime was not particularly violent or sadistic, and instead is aloof and taciturn, almost never speaking and displaying little to no emotion or will outside of obeying orders.

Male 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 emotional distress. He was always shown to cry out in fear at even the most insignificant things

Male Though outwardly brash, haughty, and arrogant, Kaigaku was in fact cowardly and selfish.

Male 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 Kibutsuji was involved.