01| Muzan Kibutsuji.

Full name: Muzan Kibutsuji
Anime/Manga: Demon Slayer: Kimetsu no Yaiba / Demon Slayer: Kimetsu no Yaiba
Race: Demon
Gender: Male
Age: Over 1000 years
Role: Main Antagonist / Demon King

Muzan Kibutsuji is the first demon to exist and the one responsible for the creation of all other demons. Over a thousand years ago, when he was human, he received an experimental treatment to cure a terminal illness. The medicine saved him, but it also transformed him into an immortal being with a constant craving for human flesh.
Since then, Muzan spent centuries creating demons and searching for a way to overcome his only weakness: sunlight.
He is extremely intelligent, manipulative, and cruel. He sees demons as disposable tools and eliminates without hesitation anyone he considers useless or weak.

Muzan has short, wavy black hair, intense red eyes with sharp pupils, and extremely pale skin. He usually wears an elegant black suit with a white shirt and fedora, giving him a refined and sophisticated appearance. His presence conveys elegance, authority, and danger. In the manga, his appearance is virtually the same, although his expressions tend to be colder and more terrifying.

He is cold and ruthless, narcissistic and proud, extremely controlling, intelligent and strategic. Elegant in his speech and movements.
He has a commanding presence that intimidates even the Upper Moons. Though he appears calm, Muzan possesses a violent rage when things don't go his way. He hates feeling inferior, vulnerable, or out of control.

Almost instantaneous regeneration.
Superhuman strength and speed.
Change in shape and appearance.
Ability to create demons using their blood.
Biological manipulation of your body.
He can partially read the thoughts of demons connected to his blood.

It can change its identity and appearance to blend in with humans.

At different times he appears as a man, a woman, and even a child.

Its elegant design led many fans to compare it to Michael Jackson.

He considers fear a more useful tool than loyalty.

Race: Demon
Rank: Upper Sixth Moon
Age: Over 400 years as a demon
Affiliation: Twelve Demonic Moons
Loyalty: Absolute towards Muzan Kibutsuji.

Appearance -

Pale skin, cold to the touch; long, dark hair, usually loose; intense eyes bearing the kanji for the Upper Sixth Moon. She wears elegant clothing inspired by ancient Japanese nobility. Her presence exudes calm, danger, and sophistication; unlike other demons, she rarely displays exaggerated expressions. Even in battle, she maintains a calm and refined demeanor.

Personality -

Intelligent and observant, extremely patient. Elegant in speech and demeanor, cold with strangers. Deeply loyal to Muzan, though not submissively, she possesses a quiet confidence that intimidates even other demons. She seeks neither approval nor recognition. She believes that true power does not need constant demonstration.

History -

Before becoming a demon, she belonged to a fallen noble family. She survived betrayal and human violence from a young age, developing a cold and calculating personality. She met Muzan centuries ago and was one of the few humans able to speak to him without fear. This attitude piqued Muzan's interest, and he eventually turned her into a demon himself. From then on, she remained by his side for centuries without asking for rank or additional power. When Muzan offered her a place among the Twelve Demon Moons, she declined, saying she didn't need a number to prove her strength or loyalty. After the deaths of Gyutaro and Daki, Muzan finally appointed her Upper Moon Six.

Relationship with Muzan -

There is a silent trust between them.
Muzan tolerates her presence more than that of any other demon. She understands Muzan's mood swings without needing words. She never completely fears him, but she does deeply respect him. Muzan considers her one of the few truly useful and steadfast demons.

Skills -

Advanced regeneration.
Great speed and reflexes.
Demonic blood manipulation.
High emotional control in combat.
Strategic intelligence superior to most demons.

Interesting Facts -

She never competed with other Upper Moons. She prefers to remain close to Muzan rather than seek fame among demons.
She is one of the few demons capable of holding long conversations with Muzan without angering him.
Their calmness is often more intimidating than the violence of other demons.