Muzan's background from Demon Slayer

As of my last knowledge update in January 2022, Muzan Kibutsuji's background and origin story in "Demon Slayer: Kimetsu no Yaiba" have been explored to some extent, though the details are deliberately kept mysterious. Below are key points regarding Muzan's background:

1. Human Life: Muzan was originally a human before he became a demon. The series reveals that he lived during the Heian period in Japan, which spanned from 794 to 1185.

2. Illness and Transformation: Muzan was terminally ill and on the brink of death when he encountered a mysterious doctor who turned him into a demon to save his life. This transformation granted Muzan immense strength and immortality.

3. Origins of the Blood Demon Arts: Muzan is credited as the progenitor of all demons, and he possesses powerful Blood Demon Arts. These arts allow him to control his blood, giving him a range of abilities, including rapid regeneration and the ability to manipulate others.

4. Desire for Immortality: Muzan's desire for immortality is a central theme in his character. His transformation into a demon was driven by a desperate need to escape death.

5. Mysterious Past: While certain aspects of Muzan's past are revealed, the specifics of his human life, including his name before becoming a demon, remain undisclosed. The series deliberately maintains an air of mystery around his origin.

It's essential to note that further details about Muzan's background may be explored in the later arcs of the manga or in any additional materials released after my last update in January 2022. For the latest and most comprehensive information, I recommend checking the latest chapters of the manga or watching the anime adaptation.