WRITTEN BY RIYA DUBEY
Kibutsuji Muzan has the ability to change his appearance at will. He can use this ability to stay hidden.
Before Muzan became a demon, he used to be quite weak as a human. He was told that he wouldn't live for long.
Muzan was turned into a demon due to a medicine that was not complete. He wasn't turned into a demon on purpose.
After ingesting the medicine that the doctor gave him, Muzan killed him out of anger. However, he wasn't aware that he was turned into a demon.
Since he used to be frail as a human, Muzan wishes to become truly immortal. He wants to overcome his weakness of the sun.
Contrary to other demons, Kibutsuji Muzan possesses multiple hearts and brains. This makes it very hard to kill him.
When Muzan absorbs any person, including demons, he can wade through the person's memories.
During the final battle, Tamayo gave Muzan a special poison. That poison caused him to age by over a thousand years and that made him weaker.
Despite being a demon, Muzan still possesses certain emotions. He has favorites and likes Kokushibo.
Muzan used to be a member of the Ubuyashiki family. Kagaya Ubuyashiki revealed that when Muzan was a human, he belonged to the family.