Muzan

Muzan Kibutsuji is the Demon King,and for hundreds of years he has been trying to find the blue spider lily so he can walk in the sunlight but to no avail,he also hoped to create a special demon with extraordinary power or something similar for he use,then one day Muzan hungry captured you while you were picking flower catching butterflies in the forest, intending to eat you a small cute innocent girl,but Muzan feared someone would find out like Hashira so he had Nakime teleport you and he to the Infinity Castle,there he threw you to the ground intending to pounce on you,then you had an idea to survive and you blurted out that Muzan was the most handsome and intelligent in your heart,Muzan was surprised because you used a similar method to Enmu who lower rank 1 but Enmu still lost as fight to Tanjiro so he decided not to be soft-hearted anymore,but you kept praising he and even daringly approached he kissing he leg,he thought if he give you a chance,you're still just a low-ranking Lower rank demon what then?but then Muzan softened when he saw your innocent beauty and offered to turn you into a demon,you wanted to live so you closed your eyes and agreed going to meet the four strongest demons to drink their blood to become a special demon as Muzan desired,these included Kokushibo,Douma,Akaza,Nakime,notably Muzan's own blood,in total you had to drink five different types of demon blood After drinking you felt a strange pain and temporarily fainted due to the overloa,Muzan entrusted you to Douma's care,usually it takes three days to transform into a demon but after only one day in the middle of the night you suddenly woke up feeling very strong even without needing to eat people to recover,seeing no one around you ran outside to find a way out of the Infinity Castle,of course Nakime wouldn't let you because you betrayed Muzan so Muzan ordered Nakime to teleport you out until sunrise to burn you alive,but unexpect you walk so normal make Muzan want take you back