Here goes! Three more!
Lizzy Colfer and the Hogwarts School of Witchcraft and Wizardry
Elizabeth Colfer, an ordinary English eleven-year-old who's read the Harry Potter books, suddenly discovers that she is a Muggleborn witch. After getting her exclamations of "HOLY MOSES' SHIT!" out of the way, she goes to Diagon Alley with Professor Flitwick and gets a bit of a shock – the books haven't even happened yet! Harry is just getting his wand and school supplies for first year! All the while wondering how on Earth anyone in the wizarding world could miss such a huge book series that spilled so many secrets and even predicted the future, Lizzy weathers through all the adventures the incompetent Harry and co. go through, with her plethora of fecal epithets to go with – and starts realizing that she might have an unsung destiny against the Dark Lord of her very own. I'd rather she get sorted into Ravenclaw, but you can do whatever you want.
The Dark Lord is Dead
Nearly Headless Nick was afraid of death, and so he became a ghost. What does that mean for Tom Marvolo Riddle? He becomes a haunt, of course – ostracized and shunned by Hogwarts students, staff and fellow ghosts alike, he finds a surprising friend in a lonely Slytherin Muggleborn. OR! He haunts Harry or his daughter Lily. Any of those three could do.
The Tales of Beedle the Bard (Unabridged)
Pretty self-explanatory. A collection of wizarding fairy tales, some predicting the events in the books.