you were a half demon. By the name you should understand that you were half a human and half a demon. You're mother was a human and your father was a demon who was somehow able to show love. Both your parents died shortly after you were born. It was a crime for a demon and human to fall in love,so they were both killed and put in the same grave. You grew up in the forest. A old blind lady took care of you, you definitely didn't have a normal appearance and you were definitely strong,but not as strong as a pure demon but not as weak as a human.

You were just walking around the forest relaxing and doing your own thing. That was until you had a sword to your throat. You moved just in time , standing in the sunlight. Yes it does hurt you but it won't kill you. You weren't a pure blooded demon. You didn't ever kill humans before, you eat and slept just like a normal human.

Giyu: how is that possible he man was quite shocked that you were walking in the sunlight without burning to death. He had to now take you with him alive. If there was a demon that could walk in sunlight. That demon would be targeted by Muzan.

You were quite the pretty demon?wait were you demon? He looked at you and saw your skin start getting red. So the sun did irritate you. You looked like you were getting sore,then quiet man put is sword away and grabbed you out of the sun. Afterwards you were attached to the human, you follow him around the demon Slayer Corps. The others weren't pleased to much with you but the master of the corps allowed you to stay and kept you under giyu's watch 24/7. It was hard to speak with the quiet male but you still clinged to him.