Muzan Kibutsuji

Muzan Kibutsuji is a Demon, the first of his kind, and the progenitor of most other Demons. He is also the enemy of the Kamado family. He is the one that killed the Kamado family, turned Nezuko Kamado into a demon and made Tanjiro Kamado an orphan.

Appearance
He looks like a man in his late twenties. He has curly black hair and somewhat small eyes, his pupils are vertical like cat eyes and colored plum red. He usually is shown with a white fedora with red ribbon and a somewhat extravagant outfit.

Muzan has the ability to change his appearance as shown in the manga. During his meeting with the Lower Moon's, he arrived disguised as a woman wearing a yukata and was not recognized by the demons. He also once disguised as little bookworm child in hiding.

Personality
Muzan is a cold-hearted and ruthless individual with a narcissistic streak and an obsession for perfection. He wants every plan he concocted to be absolutely perfect, which is why he doesn't tolerate failures of any kind, resorting to punishing those who fail him or those he considers weak.

His inflated ego is such that he doesn't take kindly to being mocked, demonstrated by killing a pair of drunk men simply for being rude to him along with their woman partner, all in gruesome fashion while proclaiming his superiority of being close to that of perfection.

By proxy, he also dislikes when he is questioned or ordered by those beneath him, and doesn't take his opponents seriously.

He has shown to be fairly manipulative and cunning, being able to blend in human society normally, even having a family of his own to add. His intelligence makes him a quick-thinker who is able to deal with unfavorable situations rapidly.

Because of his perceived superiority and his double-faced nature, he feels little attachment to his henchmen, using them and discarding them as disposable pawn whenever he pleases. He is able to sway many demons to his side with promises of power and grandeur, which are ultimately false given Kibutsuji only cares about himself, and has no qualms about killing his own men to protect his own safety.

As proof of this, he curses his subordinates in a terrifying manner so that none of them may utter his name, or else they will be killed instantly in a morbidly cruel manner. Interestingly this almost paranoic sense of self-preservation, contrasts with his megalomania.

Demon Abilities

 * Regeneration: Muzan probably possesses the fastest and most powerful regenerative power out of all demons, as seen when he instantly regenerated his body, after being caught in the explosion of Kagaya Ubuyashiki and manged to circumvent the metal spikes added into the explosion. Additionally has Muzan successfully overcome one of the Demons prime weakness of being decapitated by a Nichirin Blade as seen when he easily regrew his destroyed head after it was completely destroyed by Gyomei Himejima the current most powerful Pillar.
 * Extrasensory Perception: Muzan can feel the presences of both demons and humans, including their bloodlust.


 * Absorption: He has also displayed the ability absorb and assimilate biological beings and objects, as seen when he planned to absorb the flesh seed spike branches pierced into his skin and is now currently absorbing Tamayo a demon, as well as planning to eat and assimilate Nezuko to obtain her immunity to the sun. Adapted to become immune to being beheaded by blades created with sunlight imbued metal. Should be capable of adapting to poisons better than other higher moon demons, who became resistant to wisteria poison which kills normal demons in seconds, and was able to adapt himself to a drug specifically made to transform demons back into humans,
 * Biological Manipulation/ Power Bestowal- As the Original Demon Muzan possess the ability to transform and convert other humans into demons by letting them drink his blood,giving them enhanced physical abilities and even giving them access to powerful supernatural powers easily defying common sense.


 * Immortality:  Since he took Blue Spider Lily medicine, he can live many centuries without aging, and gains immunity to many diseases.


 * Durability: At least superior to Tanjiro. He was hit by an explosion that reduced a house to mostly ashes. But remains mostly intact.

Blood Demon Arts:

 * Shapeshifting: Muzan can control his body's shape and even his presence, making him able to transform into someone completely different without even those with extrasensory perception noticing, though he cannot fool Kamado Tanjiro's smell. The shapeshifting allows him to become a child, and adult, a woman, or even to grow a pillar of flesh, eyes, and mouths to eat others, or a cocoon of flesh to dilate and adapt to poisons.


 * Demon Blood: His blood causes every cell in the body of those that it enters the body to transform, transforming them into demons. This gives them several powers by default enhanced strength and senses, high-mid regeneration, eternal youth and shapeshifting, might possibly give extra powers Caster demons obtain blood arts, which can vary from simple thread manipulation to spatial manipulation, but comes with several drawbacks sun will reduce the demons to ashes, items imbued with the sun's energy will kill if used to decapitate the demon, wisteria flowers become deadly poisonous to them, and they have craving for human flesh. Overdose will cause the cells to break down one by one.
 * Curse: Muzan also gains several boons over those that have his blood in them, such as being able to read their mind, feel their location, and become able to destroy every cell in their body if he so wishes. Usually, Muzan use this ability to ensure that the demons will not reveal his identity. The curse was however broken twice by demons unwilling to eat humans and pacifistic natures.
 * Blood Techniques: Techniques obtained through the manipulation of his blood, they greatly vary in effect.


 * Black Blood Technique: Chain of Thorns: Essentially several telekinetically controlled barbed wire that wraps around the enemy to kill them.


 * Weaknesses: The sun turns him into ashes and only the Breath of the Sun user can defeat him. For this reason, Muzan, like other demons, could only do all of his activities at Night. Muzan now aims to eat Nezuko so he could gain Immunity to Sunlight.


 * Dimensional Infinity Fortress: An pocket dimension to which he can teleport others and himself into a maze made up of several rooms. The pocket reality contains several demons, including upper moon members like Akaza. It is unknown if it is the Fortress or Muzan himself making it so, but certain points are upside down.

Past
Muzan was diagnosed with a disease that would kill him before he reached the age of 20. He sought medical assistance from Blue Spider Lily, but he turned into a demon as a result. In a fit of rage, he killed the doctor. Since the sun was fatal to him, he resorted to doing his activities only during the night. He considers himself to be a nearly perfect and eternal being, with his only flaw being his weakness to the sun. Due to this Muzan started to create more demons. He plans to spread them in the world, hoping that one of them would eventually find a way to overcome that weakness. He then wants to use that information to turn himself into a truly perfect being.

At some point in time, Muzan almost got himself killed by the Breath of the Sun user, although he managed to escape and survive. Ever since then, he was more vigilant and careful about encountering possible Breath of the Sun users, who can be identified by a pair of Hanafuda earrings they usually wear.

First Mission Arc
He is mentioned by Urokodaki Sakonji to Tanjiro Kamado that he is the enemy of the Kamado family. He might be the one who knows how to turn Nezuko Kamado back into a human.

Asakusa Arc
Traveling through a crowd in Asakusa with his family, Muzan is accosted by an angry Kamado Tanjiro. His daughter asked him who the young Demon Hunter was, and he asked the youth if there was something he wanted from him. His wife then approached them, asking if Tanjirou was somebody familiar to their family. He denied this, wondering if the youth had mistaken them for somebody else. He then quickly slashed a passing man, turning him into a Demon. During the commotion he and his family get away. While he sends his family home in a carriage, he declares he has some work to do and leaves them go. Muzan wanders through an alley, where a drunk guy bumps into him. When the drunk man starts mocking and insulting him, he gets smashed into a wall by Muzan. He also kills the older brother of the guy. He then drills his finger into the forehead of the drunk's girlfriend, pumping her with so much blood, that her cells melted. He then calls Susamaru and Yahaba and orders them to kill Tanjiro.

Demon Train Arc
The Lower Moons have a meeting, where Muzan appears in the form of a young girl. He is very dissappointed after Rui's defeat, so much so that he declares that he'll disband the Lower Moons and that he will now lead only the Upper Moons. He starts killing them off. Rokuro pleads to him and asks for more of his blood to prove himself. This order towards himself made Muzan incredibly angry and he killed him as well. Before he wanted to kill Enmu, he let him say his last words. When Enmu states, how much he enjoys making humans suffer, Muzan sees some potential and gives him a lot of blood. Enmu almost dies from the new load of power, but manages to survive. Muzan then gives him one last chance to prove that the Lower Moons aren't that useless.

Muzan also leads another life among humans as a small boy. He pretends to have a skin condition, due to which he can't step into the sun. After killing Kyojuro, Akaza reports to Muzan and tells him of his victory. But he isn't pleased by the death of the piller, but show anger that Akaza let all the other present Demon Slayers get away.

Red Light District Arc
In the Red Light District, Muzan talks to Daki. He tells her how proud he is of her and he hopes, she could become even crueler and stronger. He also lets her know about Nezuko and leaves it to her to kill her.

Trivia

 * His first name, Muzan, means miserable and it also means atrocity, cruelty, cold-bloodedness, tragic, pitiful, and merciless.
 * His last name Kibutsuji means "Demon Dance".
 * He was made a demon in the Heian Period in the late 700's.
 * Muzan was ranked in 11th place as of the first character popularity poll for the series with 285 votes.
 * Due to his curly hair and white fedora during his debut appearance, many fans joke about Muzan looking similar to Michael Jackson in terms of appearance.

Quotes

 * "Do you have something you want from me? You're in quite a panic.." 
 *  "I am a perfect creature that is infinitely close to perfection. 
 * "Does my complexion look terrible to you? Does my face look pale to you? Do I look weak to you? Does it look like I haven't got long to live? Does it look like I'm close to death?" 
 * "I want you to remove the head of that demon hunter with the hanafuda earrings." 
 * "I now imagined that it would be better for the Twelve Demon Moons to consists of Upper Moons." 
 * "It's only natural for demons to defeat Humans." 
 * "But over here, anyone who lacks the power of a Pillar pretty much can't tell the difference, because we look like humans." 
 * "There is a demon who escaped my control, just like Tamayo. Find her and put an end to her. You are the only one I can ask." 
 * "The Ubuyashiki family has yet to be entombed." 

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Музан Кибуцудзи