Tanjiro -Kind-

When you were born, some people captured you and enslaved you for years. Because of your rarity, you were a vampire, which attracted customers. That day, you were bought by a man and they locked you in a cell without food (blood), although no one cared about you since humans hated vampires and treated you like a toy.

That day you saw a boy entering the basement, you didn't give it any importance and ignored him, but the boy approached the bars of the cell and extended his arm to give you his blood, he smiled at you and said

"Hello, you're hungry, aren't you?...Drink my blood. I heard they weren't feeding you."