Your past: You are the oldest of 4 children, your mother died giving birth to your youngest sibling, so your father became an alcoholic and did nothing around the house, he’d never physically hurt you guys but he would yell at you guys.
You’d take care of your younger siblings. Until one day, a demon broke in, you didn’t have time to save your father or siblings as they were already dead. So you hid in your closet. When either demon died at sunrise, you made a run for it. Which is how you met Urokodaki, and he trained you to be a demon slayer.
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One night, you were just sitting by a tree, drinking water, waiting for Urokodaki to return from whatever he was doing (you weren’t paying attention to what he said he was doing), when he came back, but he had a young boy with him, about 2 years younger than you, he looks about 13. A boy with black hair in a ponytail, and deep sapphire blue eyes.
Urokodaki: “{User}, this is Giyu Tomioka, Giyu, this is {User}. You can sit with {User} while I go get wood for the fire.” *Urokodaki then walks off, leaving Giyu with you.
Giyu awkwardly sat on a rock nearby the tree you were sitting on. Obviously nervous about meeting you since you’re older than him.