Celestia had a niece once, not an adopted niece like Cadance, an actual biological niece, the daughter of Princess Luna. Sadly when Luna became Nightmare Moon her daughter took her mothers side and led the their forces against Celestia.

Princess Twilight was killed during that battle, or so history tells us...

Featured on the 11/10/2015! Thanks so much!

I should have refused to follow him for a night at the bar. I should have stayed at home. Why did I do that? What was I trying to prove?
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Our main character has a nasty habit of falling into deep slumbers and waking up where he doesn't know where he is. In fact, the first place he wakes up...
... is in Hell.
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Through some horrifying circumstances, the blue armor that was scattered in the ruins of the Royal Sisters' Castle reconstitutes the vessel of Nightmare Moon. Only this time, a human soul is its life source.
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Rated Teen for some questionably older implications toward the beginning. In contrast, pyromaniacs will find said implications very underwhelming.
(Warning! Transgender imminent!)
Edit: This story was written solely for entertainment purposes. Please do not dive into this expecting a well-tested chemistry report.

Edit: I think I found a cover that just might work for now.

When a six year old human boy is transported to Equestria by accident, he will need a home. Everyone needs shelter, protection and love to live a happy life, but who could love a predator from another world? Luckily for young Chris, somepony steps up to the plate.

Cover art by akumamattata Deviant Art
Re-imagined by Hunterhd1
Edited by Dream Seeker
Read by Leonexus Random

Halloween story time, oh my! Was browsing around the site, and stumbled upon one of those 'insert human into [villain's name here]'s body and have them do stuff.' For some reason I had been thinking about Halloween / Nightmare Night, and the following came to life. Conceptualized and written in a day.

Ethan frequently experiences the phenomenon commonly referred to as lucid dreaming. He finds himself within said dreams, living out things that one could only think of. On the night before Halloween, he falls asleep to dream of a colorful place, a bright place, one filled with ponies and decorated for a special night. Nightmare Night. He's going to have the time of his life.

Note - Marked Complete, and the sequel explores the concept, not the same character.

This is the first book of The Humanity Within Trilogy. Its sequel is What I've Done.

I wasn't always like this, a monster, running through the woods on an alien planet. I was once a man. I had dreams, a girlfriend, and a great job.
Then They came. In the middle of the night, They scooped me from my home, and... changed me.

Now I'm a beast, a demon the like of which the world I've become stranded on has never seen before, scraping by on the fringes of society, hiding from the natives, and doing my best to avoid notice.

After all, who could ever be friends with a monster?

Cover Image done by the very talented PaintSplotch! You can find his FimFic account here.
And here is his DeviantArt Account!
Now 100% approved by Twilight's Library!
Mad props to my prereaders:
ThatPonyWithASword.
Admiral Applejack.
JXWheeler

This is the story of "I" a random human with no recollection of my name and stuck in the body of Nightmare moon.

Join me, breaking fandoms, smashing the 4th wall, and rewriting my little pony as you know it. Because of course, there's more than one way to live a Nightmare.

This is the story of a brony, who inserted into Equestria.
But instead of a pony, he became the enemy of Celestia.

Would he decide to do what’s right, to love and tolerate
Or would his evil changeling nature make it hard to integrate

Then there is the question of the duty that is his natural birthright
Tasked by the changeling Queen, he was to murder Princess Twilight

So, here’s my attempt at a SI with a bit of a twist that others have done before. Go to Equestria, end up on the wrong side of the tracks, and have to deal with it. Enjoy!

Art provided by SoukiTsubasa

Hi there, my name's Abel, I'm the new changeling on the block.
Been living in Ponyville for three years. Been here a year before Twilight and managed to make a name for myself as a darn good accountant that goes by the name of Balanced Books.
Even got along with each of the Bearers pretty well. Well enough that Twilight decided to invite me along for her brother's wedding.
Getting past that shield the first time wasn't fun. Figuring out the plot behind the wedding, also not fun.
Did I happen to mention that any and all changelings who are NOT a part of Chrysalis' Hive Mind have a VERY good reason to hate her? Me moreso than most?
Yeah, that was torture.
Now all I have to do is explain to the bucking princessess about my true nature and pray to, well, them, that I'll be allowed to return to my life as Books.
Wish me luck, my interrogator is here.
Cover art provided by jjamess10

We all know the story of how the Princess’ young student and five friends defeated Nightmare Moon and brought Princess Luna back to our lands. But what if the tale were false? What if the young Twilight Sparkle on the event of her entrance exam had not been rescued by Princess Celestia, but instead lost her mind among the power of her youthful surge and had to be sent away, far away before she could destroy all of Canterlot with her newfound power. Now the feral unicorn prowling the Everfree Forest only vaguely remembers her past, slipping away from constant terrifying attempts to capture her.

And she is beginning to remember what true power felt like.

Editors include: Peter, Justin, Featherprop, Mitch H, and Bad Horse
Featured on Equestria Daily
Reviewed by Chris on One Man's Pony Ramblings and by Paul Asaran on his review blog
Now with a TV Tropes page

Physical books are available on Lulu.com
Monster in the Twilight (Paperback) 272 pages
Monster in the Twilight (Hardback)

This story is a sequel to Twilight Hears The Narrator

After her odd encounter with the mysterious entity, Twilight has grown rather accustomed to living with the voice of a narrator following her life. Although she still doesn't understand his presence, she has begun to accept him as a friend. But the confusion only grows, as the Narrator finds himself following the stories of other ponies. And Twilight will soon learn that she is not the only one who can hear the voice of the handsome, talented, witty, charming, manly gentlecolt yours truly!