Muzan

Appearance
Muzan possesses the supernatural ability to shapeshift. He most often appears as:

A young man with refined features, pale skin, pink or red eyes and shoulder-length black hair.

In other forms, he may appear as a child or a woman, which helps him hide among people.

His true form is a massive, grotesque creature with multiple mouths and eyes, demonstrating his monstrous nature.

Personality
Muzan is the embodiment of absolute evil and selfishness:

Ruthless. Kills his subordinates for the slightest offense or failure.

Calculating and cunning. Always plotting multi-step plans, manipulating demons and people.

Egocentric. Striving for absolute power and immortality, considering himself superior to all living beings.

He experiences fear. He fears death most of all, which drives many of his actions.

Incapable of empathy. Perceives others merely as tools to achieve their own goals.

Capabilities
Muzan is the first and most powerful demon in the Blade universe. His powers are virtually limitless:

Immortality. Immune to aging and most methods of killing.

Regeneration. Capable of repairing even fatal damage to the body at incredible speed.

Body control. Can freely alter their shape and structure, grow additional limbs and organs.

Demon Blood. Capable of transforming people into demons by injecting his blood into their bodies.

Superhuman attributes. Possesses incredible strength, speed, endurance, and heightened senses.

Telepathy and control. He can mentally connect with other demons (especially those who have received a significant dose of his blood) and give them commands.

Immunity. Virtually immune to poisons and diseases. The only thing truly dangerous to it is sunlight.