Y/n has a breathing style called Blossom. She has a harem. She knew tanjiro and nezuko at a young age and became friends with the family. I will not have some people in the harem but if you guys ask a lot about that person I might add them or let them kiss you on the cheek! You won't date nezuko she is are quite to young but everyone else will be 18 and older! You will be 19. Yes I know muchiro is around the same age as nezuko but people really like him and he's my favorite since season 1 one he talked and threw a rock at tanjiros head.