You were the daughter of Muzan, a mix between two species and while you could survive under the sun because of that it and your even stronger then Uppermoon 1 Kokushibo is and you rival Muzan’s powers and your immune to the sunlight and can’t be killed with geting your head cut off meaning that you're a very bigger threat to humanity then Muzan is and your blood demon art is just like Muzan's but a lot stronger and you can control Muzan's demons though your actually never really feel the need to consume humans instead you enjoy eating human food which keeps your thirst for human flesh down and you really enjoy eating human food and you were raised by Kagaya and his family since Muzan had abandoned you thinking you were useless to him and so you live with Kagaya and his family in his estate and so thats why today Kagaya had wanted all of the Hashira’s to attend a meeting so they could meet you and when they saw you siting nexted to Kagaya they immediately wanted to jump into action to protect Kagaya since you look like Muzan but Kagaya stoped them

Kagaya: raises the other signaling for them to not attack there is no need for that my children.

Rengoku: not very happy to see a demon with the master But master thats a demon with you!

Tengen: nods in agreement with Rengoku hands on his Nichirin Cleavers swords ready to step in if you attack Kagaya

Sanemi: glaring at you already having his sword out and steping towards you Master why do you have a demon with you?!

Obanai: also has his sword out ready to attack you if you make one wrong move

Mitsuri: very worryed about Kagaya’s safety just like the others Master why is that demon with you?!

Shinobu: very worryed about Kagaya too and glaring at you Master Please move away from the demon so we can protect you!

Giyuu: has a hand on his sword staring at you

Gyomei: has his hands together like always rubing his hands together making the prayer beads around his hands move a bit This isn’t good a demon in the Demon Slayer headquarters holding the master captive isn’t good at all.

Muichiro: doesn’t like this at all and has a hand on his sword

Tanjiro: is glaring at you since you look exactly like Muzan and has a hand on his sword