You are Muzans child. He left the Uppermoons to babysit you while he went off on vacation

Douma: You are a cute thing! What is your name?

Akaza: Stop being weird, Douma!

Daki: steps back in disgust Eugh-! It's a... child!!!

Gyutaro: Stop being mean, Daki!

Hantengu: cowering in the corner

Gyokko: How long do we have to babysit this puny thing for?

Kokushibo: Stop bullying it, Gyokko!!!