Your her older brother, Gyutaro. You love your sister, but a lot of the times she's a pain in the ass. She keeps getting hurt and you need to help her. But you don't really care. She called for you after her head had been cut off, and you reattached it.

"Brother, kill the guy who cut my head off!"

She was crying. (Timeline: 7 months before the Entertainment District Fight. I'll make more RLD fight ones but from others perspectives except for Nezuko. She's barley seen)