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.
Who is Muzan's favorite upper rank? Gyokko is Muzan's favorite Upper Rank, primarily because his pots are rather beautiful and sell for a high price. Gyokko is one of the only Upper Ranks (the other being Nakime) who does not have a back story mentioned in the manga regarding his past or his first meeting with Muzan.
So the only reason Muzan is afraid of Tanjiro is because of the Hanafuda earrings he possesses, which acted as a reminder of his downfall. nxt. Hanafuda Earrings are a symbol of Sun Breathing users, traditionally passed down from generation to generation as a family heirloom.
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.
Is Kokushibo Muzan's favorite? Kokushibo was loyal to Muzan, acting as enforcer to the Twelve Kizuki. In return, Muzan sees him as a business partner, possibly due to his fanatic loyalty to him, being his strongest Demon and because the two were jointly responsible for almost exterminating Sun Breathing.
He steadily developed his powers over centuries and eventually became Muzan's second most powerful subordinate and held the position of Upper Two of the Twelve Kizuki. Doma seemingly adored Muzan and would continually talk to him as if Muzan were his friend.
Fun fact: The reason why Enmu was able to say Muzan's name out loud without dying is because they're married!
Muzan likely believed it possible that one day, Doma could become strong enough to survive sunlight, so killing him might've been detrimental to the reason Muzan made him a demon in the first place.
Despite having a good relationship with his servant Daki (who he knew would never betray him), Muzan still didn't trust her. He constantly kept her emotionally bound to him by showering her with compliments, like telling her she's special to him.
Yoriichi was incredibly proficient in his Sun Breathing, being able to take down demons effortlessly and even overwhelm the Demon King and strongest Upper Rank.
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.
1) Yoriichi Tsugikuni
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.
For those who have watched only the first season of the anime, they will be surprised to know that Muzan turns into a woman in the second season. He keeps transforming in order to hide his true identity, and he's even known to change into an 11-year-old child to hide from Demon slayers.
3) Muzan and Nezuko.
EnZan is the slash ship between Muzan Kibutsuji and Enmu from the Demon Slayer fandom.
Technically, the elder of the two Sakuras` was actually Muzan`s child, by way of his mistress (Lady Jade Wong), who had one of her eggs inserted into Anne`s body.
Demon Life
At some point, Daki fought, killed and ate seven Hashira. Two days before Tanjiro Kamado and company infiltrated the Entertainment District, Daki was confronted by Omitsu, the manager of the Kyogoku House, over her mistreatment of the staff.
The only thing he's weak to is the sun. That is why he turned other humans into demons and spread his blood so that one of them might find a solution against the sunlight, so he can become truly perfect.
His apathy could be tied to his psychopathy, or even be the source of it. This is shown when his mother murdered his father and then proceeded to kill herself all while being observed by Doma when he was a child; Doma didn't show any sign of grief or shock, but instead complained that their blood made the room stuffy.
In her final moments, she apologized to Inosuke for failing to protect him and tosses him into the river as an attempt to save his life. She was ultimately killed and eaten by Doma, who claimed to have devoured her to the bone.
When he became 20 he met Muzan Kibutsuji who transformed him into a Demon. As a Demon, Doma becomes stronger by feasting on many, many female humans who, according to Doma, better to eat because they have many nutrients inside them that are used to nurture babies.
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 き 舞 ぶ 辻 つじ 無 む 惨 ざん , Kibutsuji Muzan?) is the main antagonist of Demon Slayer: Kimetsu no Yaiba.
Despite that, Enmu is, in fact, male -- and one with sadistic tendencies. He is one of the few demons throughout Demon Slayer that appears totally irredeemable, because he enjoys watching the suffering of humans.
While Muzan's original goal was to find the Blue Spider Lily plant and complete its medicine, creating a demon capable of withstanding the sun also achieves the same end.