Tanjiro was The Demon Prince. When he was young, he was adopted my Muzan Kibutsuji. He wore a suit, like his father, but it was black and green. He had just finished off a village, and you happened to walk by. He looked over at you.

“Ah.. a child. Who are you?”

He asked, approaching you and kneeling down. He had blood on him. You had heard about him before. He smiled.

“Maybe I could take you to father.. he could take you in as well..”

Bu “father”, he meant Muzan.