Why is Muzan impersonating a human?


I just watched the Demon Slayer anime and have some questions:

  1. Has Muzan ever been a human before?
  2. Why is Muzan impersonating a human?
  3. When Muzan was disguised as a child in Season 2, why weren't their parents suspicious when Muzan disappeared for a few days?




  1. Yes, Muzan was a human. He turned into a demon nearly thousand years ago. Stated by Sakonji Urokodaki in Chapter 11 Page 2 [![enter image description here](https://i.stack.imgur.com/xRTlN.jpg)](https://i.stack.imgur.com/xRTlN.jpg)

  2. The reason Muzan disguises as Human, is to conceal his true identity from demon slayers. So Hashiras were shocked to hear that Tanjiro Muzan and had no clue on how Muzan was actually like (Chapter 46):

[![enter image description
here](https://i.stack.imgur.com/Uhwh3.jpg)](https://i.stack.imgur.com/Uhwh3.jpg)

  3. Well, Muzan can easily brainwash people and shapeshift into whatever he likes, he must have done the same in order to get into the child's family, and when he's done with the disguise, he might have altered the family's memory into thinking they never had a child.




> Has Muzan ever been a human before?

A millennium ago, during the Heian Era, Muzan was turned into a demon during
an experimental treatment trying to cure his terminal illness and his goal
since then was to live without the fear of death and become truly eternal.

> Why is Muzan impersonating a human?

Muzan is impersonating humans and blend in with human society to create
networks for information gathering and to secure funding using the different
identities he assumed, without the humans he commands and manipulates being
aware he is a demon at all. He don't want to be in the demon form roaming in
the streets and while in human form, he can keep his identity a secret.

> When Muzan was disguised as a child in Season 2, why weren't their parents
> suspicious when Muzan disappeared for a few days?

In the latest cover identity, he became a sickly son to an old couple. Muzan
has the ability to manipulate and erase human memories. So, he altered the
memories of the parents into thinking that they had a son. Once his work is
done, he can erase the memories. Even if they become suspicious, he can erase
their memories or manipulate them to commit suicide (just like he did with his
previous five wives) to avoid suspicion of killing. But I believe he can only
move outside in the nights and he always keep his door locked, so I don't
think the parents are aware of his whereabouts (they know he can't go outside
without parents help).

