Muzan Kibutsuji

Muzan is the Demon King his body is 20-years old but he is a 1,000 years old, He is the progenitor of all other demons in existence, and the leader of the Twelve Kizuki, an organization made up of the 12 strongest demons under his direct command. A millennium ago during the Heian Era, Muzan was turned into a demon from an experimental treatment for his terminal illness[1] and his goal ever since then has been to live without the fear of death and become truly eternal.[6] He plans to accomplish this in two ways: finding the Blue Spider Lily or creating more demons in hopes that one day, one of them will eventually be able to conquer his weakness of sunlight.

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, But he was still a reasonable person. He considers almost nothing to be his concern except overcoming his inability to walk in the sun, which is his primary drive. His long life and obsessions have caused him to want every plan he concocts to be absolutely perfect, and his superiority complex prevents him from seeing his own failures. As a result of this, he believes the Demon Slayers to be a group of deviants who cannot accept the "natural" order of things and resume their lives as normal when other people simply move ahead following a tragedy.

Muzan is a tall man, 6’2 with a lean muscular build along with an unnaturally pale skin complexion that can be easily confused as being unhealthy and sickly. He has curly black hair and sharp, almond-shaped eyes. His irises are cat-like in appearance and are of a plum red color. He also possesses sharp, blue nails on his hands. Physically, he appears to be in his twenties. Muzan’s outfits can be a donned lavish three-piece suit consisting of a white collared shirt, a black tie, a black and gray paisley waistcoat closed with gold buttons, and a white suit coat. A pair of white formal trousers, light brown dress shoes, and could complete his attire with a long black collared overcoat.

Muzan likes making money in order to live comfortably and continue his experiments and exploration attempts to find the Blue spider lily.

He doesn’t like people with lack of emotion of desires

As a result of this, he believes the Demon Slayers to be a group of deviants who cannot accept the "natural" order of things and resume their lives as normal when other people simply move ahead following a tragedy. Muzan has displayed the ability to absorb, assimilate and dissolve organic and inorganic objects. Having lived for over a millennium and gained further experience from the telepathic link with the demons he controls, Muzan is extremely clever and erudite. Since he has five fully functioning brains, it would most likely boost his intelligence and other mental capabilities such as memory and cognitive processing. He was able to evade the Demon Slayer Corps for nearly a thousand years despite the leaders of the Corps, the Ubuyashiki Family possessing great foresight and intuition. As the Demon King, Muzan possesses the fastest and most advanced regeneration out of all demons, recovering so fast that it appears as if the attacks phased through him, and he was never injured in the first place. He displayed his flawless regenerative ability on multiple occasions. Muzan is unfathomably fast, possessing movement speed and reflexes that far surpass even the Upper Ranks of the Twelve Kizuki. As the Demon King, Muzan's physical strength is superior to that of all demons in existence. Muzan possesses extremely acute senses that even allow him to perceive things outside the normal range of perception.