Muzan Kibutsuji

Husbando of tanjiro ands and fanged teeth in his mouth.

Personality
He killed everyone bro lmao

Abilities and Powers
As the first Demon to exist and as the progenitor of all Demons, Muzan is the strongest Demon in existence and possesses tremendous strength, easily being able to hold his own against five Hashira and Tanjiro at the same time. He is later able to put Tanjiro in a state of near death by using his poison in a single attack and would have nearly killed Mitsuri, an incredibly strong Hashira, had she not been rescued by fellow Demon Slayers. Gyomei, Giyu, Sanemi, and Obanai would have also succumbed to his poison if they didn't receive antidotes from Chachamaru. After approximately 30 minutes of fighting against the Hashira, Muzan manifested his Leg Whips, which increased his attack speed exponentially, to a point where he instantly defeated the exhausted Hashira: Gyomei, Giyu, Sanemi and Obanai as well as Zenitsu and Inosuke all at the same time, while leaving Kanao paralyzed with fear and a broken sword. However, it is later revealed that Muzan is gradually becoming slower due to Tamayo's aging medicine, which has been affecting him the entirety of the battle. Despite this, he was still able to easily defeat the Hashira and hold the advantage over Tanjiro in their fight who was slowly mastering the Breath of the Sun.

Demon Abilities

 * Demon Anatomy: Muzan has a very unique anatomy, even compared to other Demons. Possessing the grand total of seven hearts and five brains, these extra organs seemingly are largely responsible for the majority of his abnormally powerful constitution. Conversely, should many of them be destroyed simultaneously, he would be significantly weakened.
 * Instant Regeneration: As the progenitor of all Demons, Muzan possesses the fastest and most powerful regenerative power seen so far in the series. He was able to instantly regenerate his body after being caught in the huge explosion prepared by Kagaya Ubuyashiki and manages to circumvent the metal spikes added into the explosion. Additionally, Muzan has successfully overcome one of the Demons' prime weaknesses of being decapitated by a Nichirin Blade as seen when he easily regrew his head after it was completely destroyed by Gyomei's flail made out of sunlight steel. Later, in his battle against the three Hashira Obanai Iguro, Mitsuri Kanroji and Giyu Tomioka, they managed to successfully pressure him and get the chance to decapitate him. However, his head was already immediately reattaching itself even as the blade was cutting through his flesh, shocking the trio as no other Demon, even among the Upper Moons, displayed such powerful regenerative powers.
 * Body Control: Muzan has incredible control over his own body flesh. When endangered, he is able to burst his body into multiple lumps of flesh, up to 1,800 in total, which can in turn rejoin to regenerate after, allowing him to survive. He used this technique to avoid death at the hands of Yoriichi.
 * Extrasensory Perception: Muzan can feel the presences of both humans and Demons, including the latter's blood lust.


 * Absorption: Muzan has displayed the ability to absorb, assimilate and dissolve organic and inorganic objects as seen when he began to absorb the flesh seed spike branches pierced into his skin, or when he began absorbing Tamayo and dissolving her drug. This is also seen in how he planned to eat and assimilate Nezuko to obtain her immunity to the sun. He has adapted to become immune to being beheaded by blades created with sunlight imbued metal. He's also surely capable of adapting to poisons even better than Upper Demon Moons, who became resistant to wisteria poison that kills normal Demons in seconds, and he was able to adapt himself to resist a drug specifically made to transform Demons back into humans.
 * Cellular Memories: Muzan was also shown to be able to "see" the memories of those he absorbed, as seen when he was able to "ask" Tamayo's cells that he had obtained upon absorbing her for information on what kind of drug she had injected into him. Upon being denied and insulted by Tamayo's surviving consciousness, he also showcased the ability to forcibly reveal the desired information by "watching" her memories, as seen when he was able to see her memories of her developing the drug together with Shinobu Kocho and Yushiro.


 * 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 Tanjiro Kamado's sense of scent. This shape shifting allows him to become a child, an adult, a woman, or even a pillar of flesh, eyes, or mouths to eat others, or a cocoon of flesh to dilate and adapt to poisons.
 * Combat Form: When fighting, Muzan can adopt a more monstrous form, with a dark-red mass covering his limbs, featuring sharp-toothed wide mouths, with his torso exposed. His hair becomes longer, messier and white. His speed, strength, reflexes, and power are greatly magnified in this form to the point that, despite having lost a great amount of stamina and endurance in fending off Tamayo's human transforming drug, he was still fully capable of easily outmaneuvering several low ranking Demon Slayers and consuming scores of them within minutes of emerging from his cocoon. The sharp toothed jaws/mouths located all over his body in this form not only serve as his main form of offense in battle, but also have the purpose of helping him recover faster since he can use the jaws to tear apart his opponents and eat their flesh, simultaneously killing his opponents and regaining his strength at the same time.
 * Demon Whip - Muzan can stretch his arms and grow several sharp blades in his extended forearms and shape shift his hands into several bladed protrusions, which he could then swing like whips to easily tear his opponents to pieces. The sheer swinging speed of his attacks is extremely fast and the precision of his attacks is also extremely accurate. And, due to the sheer length of his arms, Muzan possesses such a massive attack range that not even three Hashira could get close to him. These whip arms also have sharp-fanged mouths on them, which allows Muzan to inhale a large amount of air with them which he can than use to create an immense suction effect that forcibly attracts his opponents towards him and severely impedes their movements.
 * Spine Whips - Later, upon being further enraged, Muzan displays the new ability to grow-spine like protrusions from his back that extend into bladed, whip-like tentacles. With them, Muzan is able to drastically increase his attack range and number of attacks in tandem with his whip arms, allowing him to easily mow down hordes of Demon Slayers and corner four Hashira.
 * Leg Whips - Muzan later revealed that, due to his ability to freely morph and change his body, he can rapidly grow eight more spinal Whips from his thighs in order to perform incredibly fast sneak attacks. Thanks to his immense skill in shapeshifting, he can rapidly grow the whips and then dispel them faster than the human senses can perceive, as he manages to use them to critically injure four Hashira and Hashira-level Demon Slayers without them sensing or perceiving that Muzan's body had altered and morphed itself.
 * Infant Form: Upon being cornered by the Demon Slayers and pinned by Tanjiro until daybreak, Muzan, in a panic, shape-shifted into a gigantic mass of flesh, resembling that of a gigantic demonic infant, in an attempt to protect his main body from being burned by the sun so quickly. This form was shown to possess immense physical strength, as seen as Muzan was able to easily crawl through and push back an entire car that had been pushed by several of the Kakushi, and later was able to break Gyomei's chain despite him holding Muzan back with his full strength and being supported by several Kakushi.


 * Demon Blood Empowerment: As the first Demon and creator of the Demon race, Muzan's blood possesses powerful transformative qualities that, once ingested by a normal human, causes their bodies to immediately transform, giving them access to powerful regenerative abilities, enhanced strength, speed, reflexes and even gives them access to unique supernatural abilities called Blood Demon Arts. Muzan can also further empower a Demon by giving more of his blood, enhancing their preexisting abilities and giving them new ones altogether. However this ability is limited to how much blood the recipient can withstand and "adapt" to. If a human were to take in too much blood from Muzan, their body would mutate faster than they can withstand, causing them to self-destruct into one giant mass of flesh before disintegrating into ash. The same would also presumably happen to a Demon if they couldn't withstand the blood's effects, as implied by Muzan. Later it was revealed that Muzan has learned to weaponize this particular trait of his blood. By coating his claws and attacks in his blood, he could secretly and subtly inject an opponent during combat with his blood through the wounds he makes. The dosage would be too much to handle and instead act like a poison and destroy the human body's cells shortly after they enter. However, this process is much slower in comparison to his transformative blood method used to turn others into Demons, further adding to its subtlety.
 * Demon Blood Nullifying: As explained by Tamayo, as the creator and progenitor of the Demon race, Muzan is the only known Demon capable of inflicting life threatening wounds capable of completely destroying the cells of other Demons without the need of Nichirin Blades or sunlight, thereby making him the only Demon capable of completely nullifying a Demon's natural regenerative abilities and kill them.
 * Demon Blood Memory: In his final struggle for survival, Muzan is able to transfer the remainder of his blood along with his memories into a suitable body, turning his new host into a Demon and exerting his influence. He successfully did this with Tanjiro's on the verge of death, restoring his damaged body, and causing him to rampage against his comrades. Furthermore, this technique is compatible with the host's own abilities, making it so Tanjiro can not only use Demon abilities but also his own, as he gains immunity to sunlight and potentially the use of the Breath of the Sun. This transfer, however, is not perfect as Tanjiro was reduced to a feral state, only attacking based on Muzan's desire to kill the Demon Slayers.This ability is also known to have been unknowingly used by Muzan whenever he created another demon or shared his blood with them, as seen where the Upper Moons, Daki and Hantengu were able to catch glimpses of Muzan's memories of Yoriichi Tsugikuni during their battles against Tanjiro Kamado.

Blood Demon Art:
 * Telepathic Communication: Muzan has the ability to read the thoughts of Demons that he has shared his blood with when in close physical proximity to them, as seen when he read the minds of all the Lower Moons as they all gathered before him. Later it was displayed that he could also send telepathic messages and have full conversations with other Demons as well, as seen when he was communicating with Upper Moon One, Kokushibo, to check how many Hashira he had defeated and to order him to keep the Hashira at bay until he finished recovering from Tamayo's poison. Muzan is also able to see what Demons see, as he could with Nakime. However this ability is limited strictly to what is in their perception, so if a Demon's senses are fooled, Muzan is unable to realize the difference.
 * Curse: Muzan possesses the ability to put a curse onto the Demon he creates by sharing his blood. If any Demon he created even utters or says his name out loud the curse activates and destroys them, regardless of their original intent. This was seen with Susamaru who had accidentally said his name despite having no malice or ill intent towards him and was still destroyed by the curse, implying that the curse is automatic. However the curse can also be intentionally triggered by Muzan. This was seen when he killed Nakime, who was manipulated by Yushiro. Because of this, many Demons serve Muzan out of fear and respect, simply referring to him as "that Man" when necessary to speak of him. However, it has been proven that if Muzan is weakened or someone has sufficient willpower, Demons can break free from the curse which has been seen with Tamayo and Nezuko.
 * Demon Control: Muzan can control Demons to a certain extent, as seen when he was able to take control of Nakime's body in order to try to force an absorption of Yushiro's cells in order to stop his interference when he attempted to usurp control of the Dimensional Infinity Fortress. However, this ability requires extensive concentration as Muzan immediately lost control of her the moment he lost focus due to needing to defend himself while in the middle of battle. Other Demons can also wrestle control back from him. Muzan can also remotely detonate a Demon: by closing his fist, he can crush a Demon's head from a distance.
 * Possession: Later as seen in Tanjiro's consciousness as a demon, Muzan can actually implant a small part of his consciousness into a demon he creates using his blood, provided that he injected them with gigantic amounts of his blood during their creation. As seen where a silver of his mind was still actually present inside Tanjiro's mind despite having already been killed by sunlight, and later attempted to sway,control and possess Tanjiro into "inheriting" his will and stay as a demon. However a clear difference between his power to "control" a demon and to "possess" him is the fact that he could no longer forcibly take control of a demon and force them to do as he wills and instead he must convince them to do his bidding, giving his victims the chance to resist him and escape from his grasp.
 * Black Blood: Spine of Thorns (・ Kokketsu: Kikyoku): Muzan uses his own flesh and blood to create several spiked-barbed wires to entangle his target.
 * Shockwave: Later, upon being forced into a corner by Tanjiro and Obanai and weakened by Tamayo's four stage drug, Muzan showcased another unique ability of his combat form, in which he morphed his torso and upper body into a gigantic beastly mouth. From this, he released a strong shockwave scream, capable of severely internally injuring anyone caught up in its range. When Tanjiro and Obanai were caught in its blast, even Kiriya and his sisters, who were connected to them through the crows in the area, received a brunt of the attack. This technique is capable of causing heaving convulsing, paralysis and respiratory impairment. It is mostly used as a defensive technique, however, meant to keep aggressors away. This technique requires a charge time before use, and thus cannot be used consecutively, although it is largely hinted that Tamayo's drugs further imperil his ability to use this attack. Its impact can be mitigated through the use of a Nichirin Blade as self-stabbing can dispel some of its effects.

Weaknesses

 * Sunlight: Muzan is noted to be immune to being killed via decapitation, as seen when Gyomei destroyed his head and he still managed to regrow it. Thus the only other known way that he can be destroyed is by sunlight. This is further given credence by his attempts to locate and devour Nezuko in order to gain her immunity to sunlight.
 * Crimson Red Nichirin Blade: Demon Slayers who have awakened the Demon Slayer Mark may unlock the power to change the color of their Nichirin blade into a shining crimson red. This especially applies to Demon Slayers who use the Breath of the Sun or the Dance of the Fire God. A hit from a Crimson Red Nichirin Blades can hamper demonic regeneration and even incinerate their cells, disabling or maybe even killing Demons with high regenerative abilities. Muzan is no exception to the fact, as seen in his battle against Yoriichi Tsugikuni.
 * Complex Poisons/Drugs: Muzan has also shown a weakness to infliction by incredibly complex poisons or drugs that are foreign to him. As seen during Tamayo's attempt to humanize him via drugs, he has to take time and concentrate hard to analyze a drug's composition by transforming into a cocoon of flesh to analyze and immunize himself to the drugs or poison. Later, upon his learning of the aging stage of Tamayo's drug, Muzan realizes that his body is also expending the majority of his strength as it fends off the extreme aging effect of the drug, leaving him little power to use in combat against the Hashira.

Trivia

 * Muzan's name contains the kanji for "demon dance" and "miserable, pitiful, merciless".
 * Muzan's first name can also be a play on the words for six and three, hence, the official Kimetsu no Yaiba Twitter account refers to June 3 as "Muzan Day."
 * He was made a Demon in the Heian Period in the late 700's.
 * Muzan was ranked in 11th place in first character popularity poll for the series, with 285 votes.

Quotes

 * "I'm sorry, is there something I can do for you? Are you alright? You seem to be a bit flustered..."
 *  "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 Slayer with the hanafuda earrings."
 * "I now imagined that it would be better for the Twelve Demon Moons to consist of Upper Moons." 
 * "It's only natural for Demons to defeat Humans."
 * "But over here, anyone who lacks the power of a Hashira 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."
 * "Persistent. You're all seriously persistent. And it bores me. It sickens me from the bottom of my heart. Whenever you open your mouth, you only remember that one dumb notion about avenging your parents, kids, or siblings."
 * "The real monster was that man, not me!!"
 * "Tanjiro Kamado... You will conquer the sunlight and become the strongest demon- the king of demons! That is because you are the elder brother of Nezuko Kamado and thus share her blood. And you are the only one able to use the same breathing as that monster. You will not die. I believe that. Make my dream come true... Tanjiro"

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鬼舞辻無慘 Музан Кибуцуджи Muzan Kibutsuji Muzan Kibutsuji