Muzan Kibutsuji

Muzan Kibutsuji (鬼舞辻無惨 Kibutsuji Muzan?) 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. 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. 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. 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. 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.

Powers and Abilities:

Regeneration: Muzan is probably the fastest in term of regeneration. Even having his body destroyed and his head completely destroyed wouldn't kill him

Extrasensory Perception: Muzan can feel demons' and humans' presences, as well as bloodlust.

Absorption: He was going to absorb Tamayo, and planned to absorb spikes that penetrated his flesh, as well as planning to eat 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 adapting to a poison made to transform demons into humans,  Biological Manipulation/ Power Bestowal through blood,  Blood Manipulation, Telepathy of those he shared his blood with Teleportation and  Spatial Manipulation with Dimensional Infinity Fortress,  Resistance to poisons.

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.