The star system Omega Centauri was just another oddity on a map to scientists in the not too distant future. However when they found the star was orbiting an earth-sized, earth-like planet instead of a black hole as its motion had suggested, a mission was scrambled to investigate this most unusual of celestial behaviors.

Hamstrung by politics, and nearly crippled before it began, the 'Lone Ranger' mission was reduced to just one crew member and left to his own devices.

These are the logs of Arrow 18 and its lone commander. This information is classified TOP SECRET by the Global Space Agency.

Do NOT tell the princess.

"My name is Lyra Heartstrings, and you will not remember me. You won't even remember this conversation. Just like with everypony else I've ever met, everything I do or say will be forgotten. Every letter I've written will appear blank; every piece of evidence I've left behind will end up missing. I'm stuck here in Ponyville because of the same curse that has made me so forgettable. Still, that doesn't stop me from doing the one thing that I love: making music. If my melodies find their way into your heart, then there is still hope for me. If I can't prove that I exist, I can at least prove that my love for each and every one of you exists. Please, listen to my story, my symphony, for it is me."

Cover pic by Spotlight: askspotlight.tumblr.com

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

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.

This story is a sequel to My Little Alicorn

After the events of "My Little Alicorn," everything seemed to be back to normal...except for one pony. Prince Blueblood is now trapped as a colt, his title, possessions and birthright stripped for his crimes. Before Princess Celestia will return him to normal, however, he must prove himself by attending Magic Kindergarten. Even worse, his current situation has attracted the vengeful gaze of two ponies he has offended in the past: the Captain of the Royal Guard and the Moon Princess.

Will Blueblood rise above his past self and emerge a better pony? Or will he sink back into his old depravity, and be stuck a colt for the long term?

Note: This is a sequel to "My Little Alicorn," so you might want to check that out first.

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.

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)

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!

It was such a small wish...

It's been nearly a year since the Jewel Seeds fell to Equestria and changed the lives of Twilight and her friends. The Time-Space Administratrion Bureau is officially opening talks with Equestria, and Twilight's new human friends are returning.

The joyous occasion is interrupted, however, by the appearance of a new threat; a set of mysterious mages armed with powerful Devices and daunting magical prowess. Who are these mysterious people that call themselves the Wolkenritter? Who do they serve?

Twilight and her friends, both old and new, are once more forced into conflict. This time, however, Equestria's future may very well hang in the balance.
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This is a sequel to Magical Pony Lyrical Twilight. Please read that story before beginning this one. You can find the story here.

Magical Pony Lyrical Twilight by PurpleProse is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

What if Nanoha never became the White Devil?

Twilight Sparkle, as everypony knows, is a magical pony by nature and profession. However, even she is confused when she encounters a mysterious ferret and an equally mysterious jewel. Forced into conflict by a monster attack, Twilight releases the power of the jewel, summoning the device known as Raising Heart.
Tasked with the retreival of a set of mysterious artifacts known as the Jewel Seeds, Twilight and her friends face an entirely new set of challenges. Unbeknownst to them, however, forces outside of Equestria are moving to claim the very same artifacts they now hunt.

A crossover with Magical Girl Lyrical Nanoha, with an equine twist!
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A sequel has begun. Go Here For Magical Pony Lyrical Twilight A's

Magical Pony Lyrical Twilight by PurpleProse is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.