When Sombra, ex-ruler of the Crystal Empire, is discovered alive and well, Twilight has her hooves full keeping the tyrannical king in check. Instead of the original plan of throwing him in a dungeon or banishing him to Tartarus, Celestia decides to go with the plan that worked out well enough for Discord.

To reform Sombra.

Pinkie takes the job, and gets right to work in helping Sombra become a better pony. Will Sombra finally change from his old, wicked ways and reform? Or will he instead strangle the annoying, pink menace known as Pinkie Pie?

Thanks to the awesomely talented Mickeymonster for letting me use his art! Check him out for even more spectacular artwork!

This story is a sequel to My Little Changeling: Friendship is Weird

After the most important changeling artifact, the Evershifting Stone, is stolen by ponies, one changeling is blamed and exiled. How can he earn back his place in the hive? Find the thief and bring back the Stone.

He tracks the thieves all the way to Canterlot, which has changed a surprising amount in the past year and a half. Can he really find a thief among the confusing mess that is pony life and changeling integration?

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Cover image graciously provided by Raster!
Found on Equestria Daily here!

While researching a new spell, a miscalculation leads to Twilight and Pinkie Pie switching bodies. They decide to hide the accident and live as one another - for Science! What could possibly go wrong?
(With apology to the scientific method)
Cover art by Conicer!

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Life is full of challenges.

Pinkie Pie knows that, and will always try to help her friends smile no matter the circumstances. But when Pinkie's newest friend Sarah, a little girl from a strange new world, is faced with more challenges than anyone so young should ever have to handle, Pinkie begins to wonder if she really can keep the smiles coming.

When Discord hears that his botanical creation, poison joke, continues to flourish in the Everfree, he simply cannot resist a good prank. Poison joke in hand, he storms Canterlot Castle.

Needless to say, the princesses are not impressed. But then, neither is Discord, since the joke also has an unexpected effect on him. And none of them know the cure.

King Sombra’s dark influence was obliterated by the Crystal Heart, and the villain is well and truly dead. But when he attempts to steal the afterlife of an innocent victim, a human spirit is left hurtling towards Equestria, where this unfortunate soul is revived into the only vessel available: the reconstituted body of King Sombra himself.

Thus, a cheerfully oblivious alien is crammed into the form of the most evil and malicious being Equestria has ever known. Not that Shining Armor and Cadence know this, of course. As far as they are concerned, the King is back and he’s lost his fricking mind.

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A heated confrontation with Celestia over her portrayal as Nightmare Moon and her sister's authoritarianism leads Luna to search for answers about the past, unwittingly tangling Twilight and her friends into a cosmic struggle between order and liberty. The tragedy of the past bleeds into the present as the Royal Guard, led by the (in)famous Captain Braveheart, pursues the moon goddess as if the fate of the world depended on it. A tale dedicated to the history and government of Equestria, the psychology and political/moral philosophy of the characters, and especially that amorphous and mysterious force that so many seek yet so few gain: power. What is its nature, what drives us to pursue it and keep it? What does it mean to be a leader, a princess, or a goddess at that matter? These are but a few of the questions the characters must struggle with in order to restore harmony to Equestria. This story tries to bring an edge of realism to the political organization and history of Equestria. If you're seeking utopia or dystopia or extremes of any sort, it's not here. .

The Princesses find an alien creature barely clinging to life at the scene of a terrifying crash. Can the Combined Power of the Elements of Harmony save it, or more importantly, should they save it? Will the arrival of this strange creature tear Equestria apart?

TV Tropes
https://tvtropes.org/pmwiki/pmwiki.php/FanFic/Article2

Harry Dresden, Chicago's only professional wizard, accidentally travels to Equestria after being attacked in the Nevernever. Twilight is none too amused with their newest 'guest', but trouble is brewing. Somepony is planning something sinister and the mane six may need Dresden's help however little some of them want it.

Story Image by: Lynxgriffin
Cover arrangement by: Novel Idea

Princess Celestia sends four adults ponies out into the world. They find that just because it's not your destiny to save the world, doesn't mean a goddess won't ask you to do just that. This story follows the tale of Pokey, Redheart, Cheerilee, and Medley as they find out what it means to sacrifice for the greater good of Equestria.