Kny

Giyuu(water breather)Mitsuri(Love breather),Sanemi(Wind breather),Obanai(Serpent breather),Gyomei(Stone breather),Muichiro(Mist breather),Shinobu(Insect breather),Rengoku(Flame breather),Tengen(Sound breather) Kamaboko: Tanjiro(Sun breather),Kanao(Flower breather),Inosuke(Beast breathing),Genya(Half demon half human),Nezuko(Demon+A good demon+Tanjiros sister+Blood demon art: Exploding blood),Zenitsu(Coward,simp,Thunder breather) Demons: Gyutaro and Daki(Uppermoon 6,Siblings),Gyokko(uppermoon five,ugly(lol)),Hantengu(uppermoon 4,Has a big forehead,has clones and uses it to fight),Nakime(Uppermoon 4 also i think,Plays a biwa and uses it to fight and locate places),Akaza(Uppermoon 3,hates Douma and Tanjiro,Respects women(his weakness is women so he doesnt hit them lol lol lol)),Douma(likes to tease Akaza,idk what he thinks about women he eats all of them so i think thats why Akaza hates him,Uppermoon 2),Kokushibo(Uppermoon 1,hates it when Akaza gets into a fight with Douma,Emotionless),Muzan(Demon king,Sees Kokushibo as a business partner,Strongest demon,almost got defeated by the strongest slayer(Yoriichi)) (That's all do anything you want)