Muzan Kibutsuji

**Muzan Kibutsuji** is the main antagonist of *Keikaku Ya-Tai: Project Slayers*. He is the Demon King, the first of his kind, and the progenitor of all other demons in existence. Muzan is also the leader of the Twelve Kizuki, an organization of the twelve strongest demons in existence that serve directly under him.

A millennium ago, during the Heian Era, Muzan was turned into a demon during an experimental treatment trying to cure his terminal illness, and his goal since then was to live without the fear of death and become truly eternal. He plans to accomplish this in two ways: finding the Blue Spider Lily or creating more demons in hopes that one day one would be able to conquer their weakness of sunlight.

## Appearance

Muzan is a tall and muscular man, 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 colored plum red. He also possesses sharp, blue nails on his hands. 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. The outfit consisted 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 flashbacks of meeting Muzan, the Demon King sported a slightly different hairstyle and outfit in the past than he did in his first appearance. 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 Rank demons, he arrived disguised as an elegant woman wearing a long black yukata, causing the Lower Ranks to not initially recognize him. 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.

After he neutralizes Tamayo's poison 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 fangs. His skin also appears to have a dark-red mass growing from the ends of his limbs and branching onto his body. It is later revealed that Muzan has an array of scars across all his body from the wounds inflicted during his first battle against Yoriichi, which had burned down into him to a cellular level and never fully healed despite hundreds of years. These wounds are not visible in plain sight and come to light as he weakens.

During his final struggle, and as a way to slow down the effects of the sunlight, 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.

## Personality

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 visually 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. The manga shows him to be more expressive, particularly when enraged and his facial features are exaggerated to demonstrate as such (possibly as a way to display his normally unreadable emotions). In the anime, his expressions change slightly 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.

## Abilities

**Overall Abilities:** As the Demon King, the first and the progenitor of his kind, Muzan is the strongest demon in existence. Even after dissolving a drug that was supposed to weaken his powers and turn him back into a human, Muzan easily annihilated close to a hundred Demon Slayers in a short period of time effortlessly. In his bout with a marked Touma Kamiyama and Tatsuma Akeboshi, the former stated that an Upper Rank's strength is incomparable to Muzan's, while the latter was unable to even follow his attacks and could only dodge by pure instinct. After Tatsuma got close to the Demon King, Muzan nonchalantly slashed out Tatsuma's eye, and later stated that his attacks were too fast for him to detect through smell.

**Biological Absorption:** Muzan has displayed the ability to absorb, assimilate and dissolve organic and inorganic objects. This was first seen when Muzan absorbed the flesh seeds that pierced his skin in order to nullify its effects. Later, he also accidentally absorbed Tamayo's arm as well as a drug that turns demons back into humans. This is also seen in how he planned to eat and assimilate Nezuko Kamado to obtain her immunity to the sun.

**Combat Form:** When in combat, Muzan can adopt a more monstrous and battle-esque form, with a dark-red scale-like mass covering most of his body (prominently on his limbs, his forehead, and the entirety of his lower body), featuring sharp-toothed wide mouths all over of his body, and longer pale white hair. The sharp toothed jaws 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.

**Demonic Blood:** After his experimental treatment gave him a new body and physiology, Muzan develops blood with special mutagenic properties that can transform humans into creatures known as demons. His special blood also seems to give rise to a plethora of special abilities to those that assimilated his blood such as powerful and quick regeneration, the power to control the flesh, immortality, an accelerated growth rate, enhanced physical prowess and even supernatural abilities called Blood Demon Arts.

**Extrasensory Perception:** Muzan possesses extremely acute senses that even allow him to perceive things outside the normal range of perception, which he displayed by easily discerning the presence of humans instantly even when they were scattered all around a mountain and detecting the wounded Demon Slayers regaining consciousness despite being far away from them. This was also shown when Muzan was able to discern the locations of Zenitsu, Kanao and Inosuke with great accuracy solely by the dust clouds rising and the sounds that they produced.

**Genius Intellect:** Having lived for over a millennia and gained further experience from the telepathic link with demons he control, Muzan is extremely clever and erudite. Since he has 5 fully functioning brains, it would most likely boost his intelligence and other mental capabilities such as memory and cognitive processing. He was also 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, and has also used demons to create distractions somewhere far away when he wants to hide something from the corps.

**Immeasurable Speed & Reflexes:** Muzan is tremendously fast, possessing movement speed and reflexes that surpass the Upper Ranks of the Twelve Kizuki. During the Infinity Castle Arc, even after being weakened by a drug specially made to defeat him, he was able to massacre dozens of Demon Slayers before they can even react. Additionally, Muzan was so fast that Kazetaro and Bushako couldn't even see them and could only rely on pure luck and instinct to evade his attacks.

**Immeasurable Strength:** As the Demon King, Muzan's physical strength is stronger than all demons in existence. This was shown when he killed a grown man with a single punch to the face, causing him to fly back, hitting a building and causing cracks in it. He also managed to kill a bigger man by simply kicking him. Even after being severely weakened by the many drugs that weakend him, he possessed enough physical strength to destroy huge sections of buildings, create massive craters in the ground and lift the debris of buildings that trapped him quite easily.

**Unlimited Stamina & Endurance:** Like all demons, Muzan has absolute and infinite stamina and endurance, staying in optimal physical and mental condition all the time as well as being able to endure waves of onslaught as if it were nothing. This was shown when he didn't flinch nor show signs of pain or agony when getting slashed and pierced by the bright red Nichirin Swords of the Hashira, which was shown to cause immense pain to Upper Rank One, Kokushibo himself.

### Blood Demon Arts

**Biokinesis:** Muzan's Blood Demon Art grants him powerful biokinetic abilities. Muzan has displayed the ability to alter and control his flesh, limbs, and even his organs. Using his Blood Demon Art, Muzan can change his facial features, replicate and move the organs in his body, create weapons using his flesh and bones, contort his entire torso into a giant mouth, or even create flesh puppets that he can control. He can also split himself into hundreds of pieces that can reattach themselves and regenerate into his full body.

* **Shapeshifting:** Muzan possesses the most powerful and advanced shapeshifting ability out of all demons in existence. Not only can Muzan change his appearance flawlessly, he can also change his aura and presence which can even fool the enhanced senses of Lower Rank demons. He has used this ability to transform into a woman, a child and even a large cocoon of flesh.

#### Techniques

**Black Blood, Bramble:** Muzan uses his own flesh and blood to create several black spiked-barbed wires to entangle his target.

**Shockwave Energy Blast:** Later, upon being forced into a corner by Kazetaro and Yukitaro and weakened by Tamayo's four stage drug, Muzan showcased another unique ability of his Blood Demon Art, in which he morphed his torso and upper body into a gigantic beastly mouth. From this, he released a strong energy-like shockwave that damaged the nervous systems of those caught in it, causing extreme seizures and convulsions, even rendering them unable to breathe for a brief period of time. This attack was so strong that when Kazetaro and Yukitaro were damaged by this technique, even Kiriya and his sisters, who were connected to them through the crows in the area, received a brunt of the attack.

### Infinity Castle Arc

* Demon Slayers vs Muzan Kibutsuji: Part 1

### Sunrise Countdown Arc

* Demon Slayers vs Muzan Kibutsuji: Part 2