Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

For almost a thousand years, the immortal Nightmare Moon has reigned over Equestria as Empress. To the average pony, Nightmare Moon is an overarching enigma whose rule is absolute and whose wrath is terrible. But to Twilight Sparkle, who as an orphan has never known her parents, the Empress is something else entirely. When the young unicorn is brought under the royal wing as an apprentice, she learns a great deal more about the supposed tyrant than she ever knew. But as Twilight is introduced to life with her new mentor, she is thrust into a world of political intrigue, conspiracies and secrets. Secrets that were never meant to be revealed. As allies and enemies plot against the very peace of the nation, will Twilight fall prey to the perils of her new position? Or will she prosper and find in Nightmare Moon the mother she never had?

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My eternal gratitude to my editor, LordOfTheWrongs, without whom Night's Favoured Child would not be the story it is today.

Now with added TVtropes!

Luna has had enough of Celestia's games, and has found the perfect means of revenge. Using a long-forbidden spell, she transforms her sister into little more than a small filly, all so she could pull the greatest prank ever. Unfortunately, she soon learns that before you fool around with dangerous magic, you really need to read the fine print...

A sequel can be found here.

During a traumatic event, an outsider finds himself flung violently into Equestria. His physical form is warped into that of the inhabitants but will his mentality follow? And even more importantly, will anypony truly accept him for who he is? Take a journey alongside this inexperienced youth as he finds himself in a strange new world with very different customs and tries his hardest to find a place for himself where he didn't before. A pity he can't even remember his name...

Okay, the basics. It's first person almost entirely. Very, very long chapters. I try to wrap them up around twelve to thirteen pages but a few slipped over that, especially towards the end. I'll release them slightly stagnated, as I'll be making final revisions as I go. Character tags are NOT final. I'll add more main characters as they show up in each chapter. Expect an update one or two times a week, probably. I adore reviews and structured, constructive criticism. Even if you just want to say you like it, that's fine too. :) I write stories to entertain peoples, so any evidence I get that it's working will encourage me. I hope you enjoy the story!

There's been another sighting of the mysterious Mare Do Well...but this time, all of Rainbow Dash's friends plead ignorance, insisting that they've put aside their costumes for good. Rainbow Dash is determined to uncover the masked mare's true identity before she's humiliated yet again, but this time around, the vigilante seems especially interested in her as well. Will Rainbow Dash be able to solve the mystery before the culprit takes the hoax too far? Or is she in danger of losing not only her mind, but her heart?

Featured on Equestria Daily.

This story is a sequel to Off The Edge Of The Map

When Twilight is sent with Luna on a diplomatic mission to Draconia, they quickly find themselves somewhere that doesn't appear on any map, and Luna is lost in more than one way...

Thanks to RBDash47 of Pony Fiction Archive for formatting it for submission.
Title image by Valcron

Tremendous thanks to Illya Leonov and Scribbler for the Audiobook version.
Now with a Spanssh translation by SPANIARD KIWI: https://www.deviantart.com/spaniard-kiwi/art/Apoteosis-2-3-857110089

The wheels of fate turn in mysterious ways. When a unicorn colt has an accident on the edge of the Everfree, nopony knows who he is. Assuming his brain was jostled by the accident, they ignore his absurdist notions of not being from this world, and not being a pony at all. However, when he is involved a terrible incident that threatens the lives of his only friends in the world—Ponyville's three most rambunctious fillies—their friends and family begin to pay more credence to his claims.

For Warren Ashland, the clock is ticking as a chain of events that was set into motion the moment he woke in Equestria comes to a vicious head. The time will come when he must decide whether he wishes to stand alone as a human in the Equestrian world, or give it all up for his newfound friends. His actions will shape the lives of those around him.

Cover art by - GMEiden

Spike only wants things to stay the same. Time, however, has other ideas. He's going to need a lot of help... An everypony story.

(Cover image by Rannva)

Pinkie Pie is being tormented by horrific nightmares. Unable to deal with it by herself anymore she seeks out Twilight's help, but will it have been the best decision when she finds herself alone in an abandoned, fog filled Ponyville?

Sequel: http://www.fimfiction.net/story/4676/Too-Shy-for-a-Rainbow

There have been a LOT of high-quality readings of Silent Ponyville, but this one is my personal favorite:
https://www.youtube.com/playlist?list=PLGh01rbB4o3xoSV7a6Omc-UJROXHRZ1Hv

Her beauty, sullied; her wisdom, corrupt; my love for her, violated. But still I answer...

Summoned to the palace in the dead of night, Twilight takes up a burden that even her generous, loving soul may not be able to handle...

Humanized Twilight/Tyrant!Celestia.