In a remote corner of the Solana Galaxy lies a backwater planet called Veldin. Nothing important ever happens there. Nothing exciting, either. Ratchet, a Lombax with no idea of his origins, is beginning to grow bored with his life, and dreams of excitement. He wishes on a falling star for some excitement to find its way into his life.

The falling star answers by crashing into his home in the form of a basket carrying a tiny creature with a horn, a pair of wings, and four hooves. The name on the basket reads "Twilight Sparkle".
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Part of the PWNY-verse.

Edit: Now with cover art by the amazing G_Haze
Video Consultant/Technician: m2pt5 (he provides the infobot videos and similar.)

Edit: Game Timeline
Ratchet and Clank: Done
Going Commando: Done
Up Your Arsenal: Done
Deadlocked: Done.
Size Matters: Done.
Tools of Destruction: Done.
Quest for Booty: Done.
Crack in Time: Done.
All 4 One: Done.
Into the Nexus: Done.

This story is a sequel to The Wizard and the Lonely Princess

Book Two of the Lonelyverse

Having returned to the Dursleys after a highly eventful first year at Hogwarts, Harry and the alicorns had been looking forward to unwinding. As it turned out, all their hopes were for nought. Between summer shenanigans, a crazy house elf, and learning Potter family history, they've got a full summer ahead of themselves. And when they get back to Hogwarts, they'll have to deal with giant snakes, idiotic teachers, and a gathering darkness. With things going off the rails, they've got a long year ahead of them.

And if they survive that, they still got to deal with the strange power surges and dreams that both Luna and Nim have been having since soon after the Summer Solstice...

Other stories in the Lonelyverse:
The Wizard and the Lonely Princess
Hooves, Plush, and Magic: The Untold Tales
The Wizard and the Lonely Princess: Hallowe'en Special
A Nightmare Christmas

An MLP/Warhammer 40K Crossover

The Iron Warriors 38th Company has landed in Equestria, entrenching themselves like a barbed hook. They hunt the aliens of the Tau Empire, intent on destruction and pillage.
A small squad is dispatched on a reconnaissance mission, only to find that there is intelligent life on this world besides the feuding space-farers.
Will these improbably adorable and friendly equine aliens turn the damned warriors of Chaos from their blood-soaked path, cleansing them of their dark legacy with the magic of friendship and harmony?

No.
No, that isn't happening.
EXPLOSIONS!!

(Dark humor warning; limited grimdark themes)
(Cover art by Nicholas Kay)
(This series now has its own TVtropes page!)
(This story is a contestant in the Tournament of Canterlot, a charity event to raise money for Syrian refugees! Go here for details and donations!)
(Featured on Equestria Daily 8/20/15 )

This story is a sequel to Sunspawned

"Hey, Glimglim--can I call you Glimglim? I've got a serious important question for you. Why aren't you snogging Sunburst yet?"

Seath the Scaleless, White Dragon God of Verdite, Traitor to the Everlasting Dragons, Duke of Anor Londo, Grandfather of Sorcery, and now the new friend and mentor to Twilight Sparkle? What will happen when two like-minded souls from opposite ends of the morality spectrum match wits? And what will remain in their wake?

A somewhat more meta twist on a MLP/Dark Souls cross-over, inspired predominantly by a few pictures I found of Seath and Twilight together, and my bewildered discovery that for all of the stories on this site that cover these two franchises, there's only one that focuses on Seath the Scaleless and so far it hasn't seen any updates in over a year ( http://www.fimfiction.net/story/68621/scales for those curious).

For those who haven't played either the King's Field or Dark Souls games worry not. I'll do my best to either explain the lore of both in the story itself, or add an author's notes for anything that gets referenced.

UPDATE: New custom cover art at last! Courtesy of Cryophase ( http://cryophase.deviantart.com/ )

Editing is courtesy of lunarstallion

We all know of how Princess Luna fell victim to Nightmare Moon's influence. We all know of how she returned and how she was saved by the powers of the Elements of Harmony, and how her sister Celestia was overjoyed that after a thousand years her sister had finally returned to her. The question is though, why did Celestia allow her beloved sister to be forgotten by her subjects?

This is the version of the story where that never happened. This is the story where in her grief, Celestia never let her ponies forget the princess they drove to darkness with their and her own neglect. Where she made sure that everypony remembered the day that they lost their guardian of the night. How would the story have panned out with this setup?

(This story is actually inspired by the story The Return of Princess Nightmare Moon by Aegis Shield. This is by no means a copy though. The story just got me thinking about the fact that Celestia really did in a way let ponies forget their was ever a Princess of the Night or that she was her sister. Hope you all enjoy.)

As the Princess of Friendship, the only thing Twilight Sparkle loves as much as books, reading, books, making new friends, books, spending time with her friends, and...books...

...is spreading the magic of friendship. And one easy way to do that is to introduce your friends to each other.

In need of a weekend away from the castle before heading out to the Crystal Empire to spend time with her family, Twilight decides to take a little vacation to the human world...and brings three of her newest friends along.

After all, if Princess Ember, Moondancer, and Starlight Glimmer are all Twilight's friends, surely they'll get along well with each other and with Sunset Shimmer!

Right?

(Cover compiled from various source vectors.)