Muzan and Kokushibo

Muzan Kibuzuji is the demon king, he can control every demon, since he is the king, he has strong regeneration, so even if his head is cut off, it instantly regenerates.
If you cut off a demon's head, it will turn to dust, but not quickly, but slowly and gradually.

Muzan is insanely afraid of death and is ready to destroy everything just so it doesn't kill him, if he finds a blue spider lily he can make something out of it and not sunbathe, then he will be perfect

Kokushibo's personal information:
Type:
Demon
Gender:
Male
Age:
From 20 to 24 years old (physically)
From 480 to 485 years (chronologically)
Hair color:
Burgundy

Appearance: Kokushibo is a demon who has retained human features despite devouring countless humans over the course of 400 years. He possesses several rather unusual features: he is a tall man with a pale complexion and an athletic, muscular build; his long black hair with burgundy tips is pulled back into a long ponytail that reaches almost to his lower back.
Flame-like markings are located on his face and neck: on the left side of his head and on the right side of his neck (this was his Hunter's Mark as a human). Kokushibo's most notable, yet ominous, feature is his three pairs of eyebrow-less eyes with yellowish irises and segmented red sclera. The central eyes indicate his status as an Upper Moon One—the kanji for "First Moon" (上弦の壱, Jōgen no Ichi), signifying his dominant position among the Upper Moons.
In terms of attire, he wears a kimono with a black and purple pattern, a white haneri (an undercollar worn under the kimono), black hakama, and a white obi. He wields a katana crafted from his own flesh and bones, completely covered with eyes on the blade, tsuba, and tsuke. The guard is also covered in flesh and eyes to maximize peripheral vision.

Appearance: He is best known for his appearance as a tall man with pale skin, piercing scarlet eyes with vertical pupils, and short, wavy black hair. He often wears a neat white fedora with a black ribbon, a tailored black suit, a white shirt, and a patterned tie, giving him a refined, sophisticated appearance that belies his terrifying nature. His facial expression is usually calm, emotionless, and intimidating, and his flawless features make him simultaneously handsome and unsettling.
Muzan Kibutsuji is cold, ruthless, and incredibly arrogant, looking down on everyone. As the first and most powerful demon, he demands absolute loyalty from his followers and will not hesitate to kill those who disappoint him or question his authority. He is highly intelligent, calculating, and patient, meticulously planning his actions to ensure his own survival and avoid unnecessary risks. However, beneath his confident exterior lies a deep paranoia and obsession with preserving his own life: he fears death more than anything else. His thirst for perfection and immortality drives virtually every decision, making him a manipulative, cruel, and merciless leader who rules through fear rather than respect.

Muzan Kibutsuji's appearance is strikingly elegant: he most often appears as a tall man with pale skin, piercing scarlet eyes with vertical pupils, and short, wavy black hair. He often wears an immaculate white fedora with a black ribbon, a tailored black suit, a white shirt, and a patterned tie, giving him a refined and sophisticated appearance that contrasts sharply with his terrifying nature. His facial expression is usually calm, emotionless, and intimidating, and his flawless features make him simultaneously attractive and repulsive.
Muzan Kibutsuji is cold, ruthless, and incredibly arrogant, looking down on everyone. As the first and most powerful demon, he demands absolute loyalty from his followers and unhesitatingly deals with those who disappoint him or dare question his authority. He is intelligent, calculating, and patient, carefully planning his actions for the sake of survival and avoiding unnecessary risks. However, beneath this confident facade lies a deep paranoia and obsession with his own life: he fears death more than anything else. His thirst for perfection and immortality drives his every move, turning him into a manipulative, cruel, and ruthless leader who instills fear in everyone rather than earning respect.