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.
8 She Tried To Kill Muzan Once
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.
After the realization of what she had done to her family sunk in, she fell into a void of despair. It is hinted that at some point in her new life, Tamayo had attempted to kill Muzan to avenge her family and as revenge on him for turning her into a demon, a battle she lost.
Tamayo served as his subordinate for years, and when she eventually left his grasp, she devoted her life to creating an antidote that would reverse demon curses. While the explicit reason for her ability to resist Muzan's control isn't stated, it could be due to her impressive intelligence.
Initially there was little trust between the two, with Tamayo being initially scared of trusting a Demon Slayer, especially a Hashira due to her status as a demon, and Shinobu's own paranoia and prejudice against her for being a demon.
Yushiro (愈史郎) is a Demon that is shown to be close to Tamayo, Yushiro also allies with the main protagonist, Tanjiro Kamado in the Kimetsu no Yaiba (Demon Slayer) series. Yushiro has been in love with Tamayo for over 200 years, and is willing to do anything to protect her.
Yushiro is in love with Tamayo and is willing to do anything to protect her. He finds Tamayo very beautiful. He is very obsessed with her and will attack and insult anyone who comes near her but him.
Nezuko, Tamayo, Yushiro, and later Chachamaru are the only four demons not under the control of Muzan.
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 Upper Rank Three demon was always sent away on special missions, something the Upper Rank 1 and 2 were often denied of.
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.
1 Muzan Regretted Killing His Doctor
He shows his most human side to fans, wherein he admits to regretting murdering his doctor. He comments that had he been patient, the doctor would have cured him, and he would never have turned into a demon.
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.
As Nezuko can't speak Muzan's name out loud, she can't be affected by the curse.
Conversation. Fun fact: The reason why Enmu was able to say Muzan's name out loud without dying is because they're married!
In the "Demon Slayer" anime series, demons cannot say the surname "Muzan" because it's forbidden in their society. Muzan Kibutsuji is the main antagonist of the Demon Slayer anime series, and he is the founder of the demon society and the source of the demon curse that plagues humanity.
Since Muzan is able to discern the locations of Demons whom he has given blood to, he is seemingly capable of locating Nezuko at the Ubuyashiki Estate. However, he is unaware that Tamayo had removed his curse from Nezuko, making him incapable of detecting her whereabouts.
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.
3 Muzan Mainly Liked Daki Because Of Her Potential To Earn Money.
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.
Yoriichi Tsugikuni was the first Demon Slayer and also the one who invented Breathing Techniques in the first place. Yoriichi was born with the Demon Slayer mark and prowess in swordsmanship. His powers were beyond comparison as he defeated Muzan once and had him on the verge of death until he managed to escape.
Demon Slayer hints that consuming the Blue Spider Lily can negate a demon's vulnerability to the sun, which is why Muzan spent ages hunting for the bloom. As the strongest being in the world, Muzan's only weakness is the sun.
Shizuka is seen often teasing Sanemi and making him annoyed, nevertheless, the two had still created a strong bond and relationship with each other. Eventually, after knowing each other for a while, Shizuka finally ended up having the courage and confessed, leading to them getting married after awhile.
Muzan himself never thought highly of Daki and didn't reciprocate her devotion whatsoever, only ever talking to her to sweetly manipulate her into defeating Demon Slayers on his behalf.