Muzan can't control two powerful ladies One of the demons he can't manipulate is Nezuko (Akari Kitō and Abby Trott), the half-human sister of Tanjiro. According to Comic Book Resources, since Nezuko is able to cling to the humanity she has left, she's also able to block out Muzan's influences.
Moreover, while she was asleep, Urokodaki performed a unique hypnotism on Nezuko, making her believe that all humans are her family and she must not hurt them in any way. With her immense fondness for humanity, Nezuko broke out of Muzan's control, becoming free to do anything at her will.
Fans later questioned the reason for letting Nezuko live. Fans believed this could have been a strategic move from Muzan. The theory states that Muzan wanted to create a demon that developed an immunity to the sun. Upon doing so, he would consume the aforementioned demon and become invincible.
Why can't Muzan control Nezuko? Nezuko although being a demon still wants to protect Tanjiro and has no intent to harm humans unless her demon instincts kick in. This makes it hard for Muzan to control her, the same goes for Tamayo.
While she might not be as powerful as Muzan himself, her overall strength makes her easily comparable to an Upper rank demon.
Ainz's spells are so deadly that they can make Muzan's demon blood boil with fear. He's taken down some of the most powerful foes with ease, including Shalltear and Jaldabaoth, who are themselves stronger than Muzan Kibutsuji. Muzan may be the king of demons, but he's no match for Ainz's spell-slinging skills.
In conclusion, Nezuko cannot beat Akaza in Demon Slayer. In terms of power, physical abilities, regeneration rate and overall combat ability, Akaza is far superior compared to Nezuko.
Akaza was also one of Muzan's favorite demons out of all his subordinates. The reason behind this is Akaza's extreme loyalty to his master.
The two known demons who broke free of Muzan's curse are Tamayo and Nezuko. Tamayo was able to break free of the condemnation when Yoriichi fought Muzan, nearly killing him in the process. During this weakened state, Yoriichi let Tamayo go, free her from Muzan, and free her from the curse.
Tanjiro and Nezuko Kamado's lives were forever changed when Muzan Kibutsuji, the King of Demons, slaughtered their family and left Nezuko to become a demon.
With this in mind, if Nezuko had also been murdered by Muzan, Tanjiro would have no reason to be empathetic toward demons. Her transformation gave him a perspective of both demons and humans, but without Nezuko becoming a demon he would have no reason to take their feelings into account.
Secondly, Muzan would probably… eat Nezuko and Tanjiro in the hopes of obtaining their sun-resistance abilities, and also since he wouldn't be able to convince them to become demons to work under him. This would allow him to become the ultimate demon.
However, the trait that sets her apart from all other demons is the fact that she has the ability to conquer the sun, prompting the Demon King to call her the "chosen demon". Abnormal Demon Physiology: As the "chosen demon", Nezuko has several unique demonic traits that set her apart from all other demons.
Muzan Kibutsuji may have tried to kill Nezuko by exploding her after injecting a lot of his blood into her veins. But she was somehow able to survive with that much of Muzan's blood, that's what possibly made her a powerful demon.
Muzan Kibutsuji (鬼舞辻無慘, Kibutsuji Muzan) is the main antagonist of the Demon Slayer: Kimetsu no Yaiba fantasy action manga and anime series. Muzan is the powerful King of all the Demons, who has the ability to inject his victims with blood that allows him to convert them into more Demons.
And the Wind Hashira, Sanemi Shinazugawa, draws his sword against Nezuko…
Before he is able to regenerate fully, Tamayo appears and uses her Blood Demon Art to keep him in place, while using a drug that can turn him into human. Using this opportunity, Gyomei Himejima appears and destroys Muzan's head.
It was clear Tamayo blamed and hated Muzan for what he did to her, which is why she once tried to kill him. This happened a few centuries ago when Tamayo was still a fairly new and weaker demon.
11. The demon slayers successfully defeated Muzan.
It is revealed that Muzan's true fear of dying and immense desire to live and survive was due to him being born "dead," where his heart would constantly stop in his mother's womb and was assumed stillborn until he fought to breathe before his cremation.
Haruka Shiraishi: Muzan's Daughter.
The warrior Muzan feared was a swordsman named Yoriichi Tsugikuni. Yoriichi was the only slayer before Tanjiro who came close to killing Muzan, and the flashback of their fight occurred in Chapter 187.
1 Muzan (Demon Slayer)
Without that antidote, it would have been impossible to kill him. So despite all her strength and humanity, Nezuko would have easily lost to Muzan.
Weaknesses: Wisteria flowers are poisonous to her. Exposure to sunlight used to be lethal, but no longer affects her. Notable Attacks/Techniques: Blood Demon Art: Blood Burst: Nezuko ignites her blood and turns them into flames that only burn demons and their blood demon arts.
Refusing to feed on blood initially made Nezuko weaker and gave her a greater gap to overcome when fighting other demons, but her willpower later contributed to huge power boosts during several battles, most notably when she used her awakened form for the first time when fighting against Daki, an Upper Rank demon.