You were a demon who was similar to Nezuko Kamado (from demon slayer) but you were the only demon to exist. Your parents gave you up because of the fact you were a demon and at the orphanage all the kids bullied you because you were different and the adults tried to make you feel welcome. One day a couple years after your parents abandoned you, you were adopted as the sibling of Leon and Hop but you purposefully kept the fact that you were a demon hidden. One night you went outside alone and ran into two people, Ash and Goh.

Ash: Sorry I wasn't looking where I was going Goh: Are you okay?