Muzan Kibutsuji, the main antagonist in Demon Slayer, utilizes various human disguises for a few key reasons:

Please note that the following contains Demon Slayer spoilers!

Muzan Kibutsuji is the ancestor of all demons in Demon Slayer. Muzan is cunning and shrewd; his main flaw is that he has spent ages working in the shadows, avoiding the sun. He possesses a wide range of unique skills. One of his abilities is the ability to control every aspect of his body, including his blood, cells, flesh, and organs, at whim. This allows him to alter his looks and face to resemble various persons. Muzan makes great use of this power to adapt and hide his demonic identity, so much so that he is invisible to the general public.

For over a millennium, Muzan had been searching feverishly for the blue spider lily, which held the key to surviving sunlight, as well as for a demon that could subdue the sun. All the while, he had been hiding to fit in with Tokyo society and gather intelligence.

Because of his narcissistic tendencies, Muzan was able to conceal his contempt for people and easily control them. He was also able to assume multiple personas at different times, including that of a woman, child, and even a family guy. Fans are left wondering why this vicious demon keeps making multiple appearances, considering these are strange human disguises.

The Motivations for Every Human Version of Muzan Kibutsuji

The Official Fanbook of Demon Slayer Describes the Inspiration Behind Muzan’s Masks.

Muzan had a human family when he was originally shown in Demon Slayer’s season one, episode #7, and Rei, his fictitious wife, called him Tsukihiko. They also demonstrated their wealth by driving a car, which was a privilege of the wealthy during the Taisho period, and by dressing expensively in western fashion. In the Official Demon Slayer Fanbook, Muzan’s human forms are explained. It says that he kills rich people so he can use their appearances to amass money and power, which will enable him to get information more readily.

This demonstrates that it wasn’t his biological family—he is merely impersonating Rei’s spouse to gain money—and it also helps him conceal his demon form and travel rapidly. In addition, Muzan changes into a woman dressed like a geisha in episode #26-26. Muzan can use his adept imitation to seduce men into looking for him in the Blue Spider Lily during the day and to obtain information in situations that are not available to him in his male form.

Demon Slayer made a cameo as a young child named Toshikuni in episode #11 of season 3. He is depicted in this state in a library, and it is suggested that he is reading voraciously. This gives Muzan the opportunity to look for information about the blue spider lily in human literature and create a location for making an elixir that can endure sunlight. Muzan is willing to go to any lengths to achieve his objective of being a perfect being, as evidenced by the efforts he takes to pretend to be other people, creatures he considers inferior.

What Became of the Families of Muzan

When his families are no longer needed for his purpose, Muzan lets them go.

Muzan murders two women in the Demon Slayer’s Swordsmith Village Arc season finale: one is the potential mother of the child he was mimicking, and the other is a worker who was adamantly pleading with her employer for assistance, suggesting there were more people in the house at the time. Muzan was a nasty person, thus it’s likely that he slaughtered the entire family in order to disappear. This is undoubtedly the result for every human that comes into contact with Muzan. It is also said in The Demon Slayer’s Fanbook that Muzan killed five of his wives with his evil tongue.

Nezuko no longer needs to pretend to be a human because he is now the demon that Muzan had been waiting for to conquer the sun. As demonstrated by Muzan’s human past, in which he killed his doctor and declared his intention to exterminate all living things, he had always lacked empathy and sensitivity despite having lived as several humans for a millennium. The explanation behind his many human guises demonstrates to viewers that, despite his outward appearance, Muzan Kibutsuji is a genuinely unredeemable evil who just utilizes other people to further his own agenda.