Demon Heirs

**THIS IS FAN-MADE NON-CANON MATERIAL AND A PART OF THE NEW CANON PROJECT**

Demon heirs were a collection of unheard and unknown demons. As their name suggests, they are “heirs” to the title of the demon king. They were hand-picked by Muzan after his near-death confrontation with Yoriichi Tsugikuni.

They were either primordial demons, ones who were incredibly loyal to Muzan, even more so than the Twelve Kizuki, or a biological child of Muzan, who had the potential to become powerful and dangerous demons if their demonic abilities were ever awakened and amplified. Demon Heirs will take on the title as the new demon king should Muzan ever die. However, Muzan only gives this title to demon heirs to use them as his incarnate and take over their body should he ever die. This is because Muzan has given the demon heirs enough amount of blood to be able to completely take over and destroy the heirs’ conscious minds in place of his own. Through the course of history, only roughly 100 demon heirs have ever existed, where most were created out of Muzan’s fear during the Sengoku Era. The only heirs remaining (As of Demon Slayer: Kage) were Muzan’s daughter, Haruka Shiraishi, and Fuma, as their numbers were reduced significantly during The Golden Age, with only a few remaining after the era was over. Their existence weren’t consciously known by the Demon Slayer Corps until the Kamakura Period.

How demon heirs are created is that they are given an incredibly high amount of blood or essence from Muzan to the point where Muzan can destroy their conscious minds for his own mind to replace in the body permanently, but their potential powers were suppressed by a blood demon art, not making them necessarily strong. Another way where demon heirs are created is that they are a biological child of Muzan, in which they naturally already contain high enough amounts of his essence, but requires amplification of their demonic abilities to transform into one. They were incredibly loyal to Muzan, but most were brainwashed into thinking that the strongest of them all will become the new ruler of the demons THEMSELVES, and not possessed by Muzan. They were also all told that Muzan will strip them of the title and kill them should they ever turn incompetent.

Once a demon heir’s mind is replaced by Muzan’s, and if he possesses another heir instead, the first heir’s body will be considered dead, as it is now an empty husk with no spirit or mind inside of it, and will disintegrate.

Unlike the Twelve Kizuki, demon heirs have to constantly roam the world to continue honing their abilities, proving their competence and loyalty to continue holding the title of the demon heir. And unlike the Twelve Kizuki, demon heirs are not as strong as they should be, as their powers are suppressed to prevent them from rebelling against Muzan. However, many are considered somewhere in between Zohakuten and Akaza in terms of strength. There were only a small number of demon heirs who had powers beyond the Twelve Kizuki, and all but one is eliminated.

## Members

* Fuma (1192 - 1912/1913)
* Tamayo (14XX - 149X) — Freed upon Yoriichi’s confrontation with Muzan
* Haruka Shiraishi (1906 - 1912/1913)