Kibutsuji Muzan

RACE Demon (Progenitor) Human (Formerly) GENDER Male AGE

20 (Human)[1] 1,000 (Chronologically)[2] HEIGHT 179 cm (5'10½")[4] WEIGHT 75 kg (165 lb)[4] HAIR COLOR Black White (From Aging Drug) EYE COLOR Plum Red[3] AFFILIATION AFFILIATION Twelve Kizuki (Leader) COMBAT STYLE Biokinesis BASE OF OPERATIONS Infinity Castle Muzan Kibutsuji (鬼き舞ぶ辻つじ 無む惨ざん, Kibutsuji Muzan?) is the main antagonist of Demon Slayer: Kimetsu no Yaiba. He is the Demon King, the progenitor of all other demons in existence, and the leader of the Twelve Kizuki, an organization made up of the twelve strongest demons under his direct command. [5]

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.[7][8]

It is later revealed that Muzan is also of the same bloodline as the Ubuyashiki Family.[9] Muzan is a tall man 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.

In his first appearance, Muzan was shown wearing a white fedora with a red ribbon and a somewhat extravagant outfit, consisting of an embroidered black tuxedo and a white tie over a black dress shirt and white dress pants. He also wore black loafers. As seen in Rui's memories of meeting Muzan, the Demon King once sported a slightly different hairstyle and outfit in the past. When he met Rui, Muzan's hair was straighter and parted down the middle. He also wore a loose-fitting tuxedo and a white half-cloak over it.

During his meeting with the Lower Ranks, he arrived disguised as an elegant woman with a chignon hairstyle while wearing a long black yukata, causing the Lower Ranks to not initially recognize him.[10] Later, he transforms himself into his latest cover identity - the adopted sickly son to an old couple - taking the form of a young child with pale, white skin and black, silky smooth, neatly combed black hair. His main outfit in this disguise is a plain white button-up shirt and black cargo shorts with long tube socks and loafers.

In his meeting with Kagaya Ubuyashiki, Muzan donned a 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. He wore a pair of white formal trousers, light brown dress shoes, and completed his attire with a long black collared overcoat.

After he neutralizes Tamayo's human-conversion drug and emerges from his flesh cocoon, Muzan's hair grows in length and turns white due to Shinobu's poison accelerating his age. He also grows numerous mouths all over his limbs, each one lined with a set of incredibly sharp teeth. His skin also appears to have a dark-red mass growing from the ends of his limbs and branching onto his body.[11] It is later revealed that Muzan has an array of scars all across his body from the wounds inflicted during his battle against Yoriichi Tsugikuni, which had burned down into him at a cellular level and never fully healed despite happening over four hundred years ago. These wounds are not visible in plain sight and only come to light when his regeneration weakens.

During his final struggle, in an effort to protect himself from the dawn's light, Muzan adopts an enlarged demonic infant form, approximately as tall as a 3 story building when standing up. In this form he has very pronounced blood vessels across his body, small claws in his hands and fanged teeth in his mouth. 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