There is only one real rule regarding changeling royalty: there must always be a queen. Twilight Sparkle is about to learn this through personal experience.

Originally written for an X Becomes a Changeling prompt almost three years ago.
Set after season three.

In an alternate reality, Twilight Sparkle awakens into a world she does not recall. Centuries after the clash of Sun and Moon, the planet of Equestria is besieged by an ancient foe and their mechanised armada.

Can she and a small host of newfound friends turn the tide of a losing war?

You can bet your cupcakes that they'll try.

Cover art by Woolly, edited slightly by a friend. You can find more of Wooly's stuff over at their Deviantart!
Font used therein created by Michal Nowak, also known as Neoqueto, and can be found here 1001 Fonts - Corruptor.

An idea which sprung to my mind a few days ago. Hope you enjoy it.

AND NOW A BIT OF ELABORATION!

Always been a fan of mechs, giant robots, gundam... call them what you want. Want me to buy something? Tell me there are robots and that you can fiddle with their weapon loadouts and the like and you have a sale.

Uniting it with a second beloved thing of mine, Friendship Ponehs, is therefore a welcome addition.

The Elements of Harmony failed. Twilight Sparkle was unable to activate their power, and the sixth never even appeared. It is her greatest failure, and the doom of all Equestria. Plunged into an endless night, she has to find a way to stop Nightmare Moon.

Her research is getting her nowhere, though, until she has a visit from a stranger in a dream, who grants her the power to face down the Nightmare. But is it enough, with the Elements lost?

Borrows themes and ideas from Persona and other places, but isn't a direct crossover with any of them.

Big thanks to Guardian of Brittania and Acarcion for help with editing!

Attempting to summon a creature without a Contract is literally gambling with your soul. However, Uzumaki Naruto is extremely lucky when it comes to gambling and manages to summon something that won't kill him outright.

"Sur-PRISE!"
"Gah!"
"Hi! I'm Pinkie Pie."
"Uh... I'm Uzumaki Naruto, future Hokage!"

Today is Princess Twilight Sparkle’s 500th birthday, and her most faithful student, an earth pony with a familiar name, can’t wait to celebrate!

Notes:
- Cover art by ErinKarsath, used with permission. Check out her DeviantArt page.
- This is a story in the Birthdayverse, and you can find the sequel here.
- Many thanks to my faithful Pre-Reader and all around super-duper best pony, Blood Lord. Go read his story, too!
- This was written during the season 3 hiatus of MLP:FiM.

This story is a sequel to Princess Twilight Sparkle's 500th Birthday

Five years have passed since the events of that fateful morning. Smarty Pants and her friends set off on an adventure of a lifetime to discover the secrets of the past when they awaken a… oh wait, that would be spoiling it!

Many questions from the first story will be answered! New questions will arise. Lunch will be had, pies will be thrown, blood will be kept inside bodies because seriously, ew blood, you guys.

Notes:
- Cover art commissioned by HAK2. Check out his other stuff, too.
- This is a story in the Birthdayverse.
- This story was written and completed (except for the epilogue) before Season 4 of MLP:FiM aired.
- Many thanks to my faithful Pre-Reader and all around super-duper best pony, Blood Lord go read his story, too!

Written for the contest in this thread.

What would you do if you woke up with god-like powers? What if the Goddess you love is without her own magic? What if Pinkie Pie's alicorn fetish was never important, until now? What if you're Twilight Sparkle and nothing makes sense anymore? The Answer: Equestria is sooooo boned.

Belated thanks for excellent editing of this beast goes out to Knight of Cerebus.
JKinsley helped with proofreading.
General encouragement/idea bouncing help from Misago.

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 Power Surge

Takes place ten years after the events of "Power Surge"

Rejection
There may come a time when the powers we gained so long ago, the skills we fought to refine and keep at their peak will need to be put to the test. That time has come, and Twilight must show that she is ready to push herself to her limits and beyond. For if she does not, everything will be lost.

Thanks to This guy! for the new and awesome cover art

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.