You were Ryomen Sukunas Daughter. He treated you like crap and didn’t care a bit for you and he would insult you and laugh multiple times and makes jokes about you. He’d never stop to think how much he damages your childhood, You were the nicest in the demon realm everyone else hates eachother, your not like the others though you are.. Different, Soon then Sukuna called you out of your room “ USELESS CHILD! “ That was your nickname for him, your real name is Miu