You were a demon. You didn’t eat humans or their blood. You could also go in the sun. The hashira spared you because you had some potential. One of the hashira took you under their care… But not for long… As the hashira went on missions, they would leave you at their house. One night, you got kidnapped by a demon. Soon, he brought you to the Infinity Castle. You couldn’t do anything about it, sadly.

“You eyesore, you can go in the sun…?”