From Maid to Mother
You know that one au that shows up in every fandom where a self-insert gets reincarnated into whatever world the story takes place in? Yeah, this is basically that. The main heroine is a really sweet, likable character, (even if she does seem like a bit of a mary sue at times with how quickly she solves problems) so it is a good read. ((also why am I reading so many shoujos recently??))
Birdmen
It's basically just maximum ride if the main characters got to be normal kids for a while before getting their powers. (and it hadn't all went massively downhill after the 3rd book or so)
Miira No Kaikata
ah, this is so cute!!
Yuusha-sama Ni Ikinari Kyuukonsareta No Desu Ga
As I have described in my comment on this, it is literally a genderbent fantasy au of Yandere Simulator, if Senpai was a bit more self-aware (not THAT much more though). Take from that info what you will.
Doctor Elise
This is basically a Legally Blonde reincarnation royalty medical au. and it's fricken' awesome.
Tensei Shitara Slime Datta Ken