Muzan is displeased with Akaza's "accomplishment", declaring that one victory is meaningless until the entire demon slayer corps are destroyed and that Akaza failed to kill the other three Demon Slayers at the train. He punishes Akaza by making him bleed profoundly and dismisses him.
Muzan knew Enmu failed his mission so he sent Akaza because he thought Akaza could kill Tanjirou.
In Akaza's case, his hatred for Upper Two stems from the fact that Akaza is a founding member of the Kizuki, while Doma joined much later but quickly surpassed Akaza in both power and ranking.
As stated by Doma, that Muzan had tolerated and allowed Akaza's unique aversion to not eating or harming women and even only went as far as only dispatching him on special missions only, a privilege not even given to Upper Rank 1 or 2. He was one of Muzan's favorites since he was loyal and serious.
3 Muzan Mainly Liked Daki Because Of Her Potential To Earn Money.
The only Demon he despises the most is the Upper Rank Two: Doma. It is quite a shocker that the second most potent Demon in the Demon Slayer is not Muzan's favorite.
Does Muzan have a favorite demon? Despite the fact that Muzan. is always shown to have disdain for his creations, Muzan does in fact have a favorite. On that list is Naki, made due to a convenient blood demon.
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.
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.
Trivia. Anne was originally planned to be Muzan`s older sister, who died by the hand of a Demon Slayer but that idea was scrapped, as the author knew practically nothing about Muzan`s early life. Instead, Anne became his wife, by which he had two children.
Despite being a blood-thristy demon who has murdered several people, he has a set of principles he adheres to. One thing that Demon Slayer fans have noticed is that Akaza refuses to eat or kill women. Additionally, the Demon King, Muzan, gave Akaza special permission to do so.
Akaza. Because of his desire to become stronger and Doma's strength allowing him to surpass himself to become Upper Two, Akaza harboured an intense hatred of Doma.
The curse prevents Muzan's name from being spoken aloud, and any who do will meet a horrible demise. One demon, Susamaru, faced this reality when battling Tamayo. Susamaru accidentally shot Muzan's name aloud, attempting to defend his honor with her mind clouded.
During that instance, Tanjiro began to call Akaza a coward for trying to escape while insulting Kyojuro claiming that he was the true winner of the battle.
2) Akaza. 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.
Before turning into a demon and changing his name to Akaza, he was named Hakuji Soyama. As a human, he was a martial arts prodigy who had a daughter named Koyuki. He trained in martial arts under the supervision of a man named Keizo. He was raised in an impoverished neighborhood.
The Wind Hashira has one of the saddest backstories in Demon Slayer. His mother had turned into a demon and had killed five of his siblings. He was forced to kill his own mother in an attempt to save his only remaining brother, Genya.
Even after becoming a powerful Demon, Muzan considered himself imperfect and wanted to somehow get rid of his weakness of sunlight.
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 encountered Muzan and Tamayo in a bamboo forest, where the two engaged in combat.
In reality, he killed her husband and got close to her because her family was influential. He also got adopted into a rich family by taking on the appearance of a child. Muzan would always target influential families to live well-respected lives without slayers bothering him.
Tanjiro's ancestor was a good friend of Yoriichi and arguably was one of his only true friends. Therefore Yoriichi gave the earrings as a gift, and since then they have been passed down the generations until they reached Tanjiro.
14) Muzan Kibutsuji (over 1000)
Being a demon, Muzan is capable of living for many, many years. However, unlike other demons that have aged over hundreds of years. Muzan is well over 1000 years old.
Tsukito, Yorogi, Kuraku, and Isatsu all agree that they are loyal to Muzan.
Haruka Shiraishi: Muzan's Daughter.