Take JK Rowling's Harry Potter Universe, add Neil Gaiman's Death of the Endless. Okay its not exactly Master Gaiman's Death. But I am not Neil Gaiman, so there is that. This is my version of what Harry Potter and his World would be like if Death was his personal friend, his big sister
Hogwarts Year One
Honestly I think this is Teen. But looking at the normal Ratings for Books and Fanfiction, I am going to have to up it to M, due to violence.
Out of Character