For better or worse, characters are defined mostly by context. A horrible monster in one story might be a hero in another. A minor hurdle in one world could be an insurmountable problem in another.

So a gap that allows characters between two contexts might be more of a problem then it first appears...

No knowledge required of A Certain Magical Index, or A Certain Scientific Railgun. (Hopefully...)

This story can also be found on Spacebattles, Fanfiction.net and Archive of Our Own.

Legends tell of the lost land of Equestria, once the home of all ponies. It is said that the Fire of Friendship was born there, and that the land was ruled over by four beings with brilliant souls and powerful magic. Gone are the glory days now. In this ruined world there are only mindless undead, ravenous changelings, and prowling, demonic beasts. The bonfires that keep the peace in the lands beyond Equestria are failing, and as the Fire fades, so too does the strength of nations.

Yet, perhaps there may still be hope. Perhaps, somewhere in the heart of that forsaken kingdom, there may still be a way to break this curse.

A Dark Souls crossover. Expect pain and misery.

Part of the Borderworld.

This story is a sequel to Awakening

This is the long dark night of the soul. More than 10,000 years have passed since Celestia’s reign over Equestria ended and the entire continent sank into the ocean and faded into myth and legend. Although the pony tribes have colonized the stars, the earth ponies have lost their connection to the land, the unicorns no longer think magic even exists, and the pegasus tribe has forgotten how to fly.
Although the principles of magic and friendship and Harmony are under constant assault in this age of war and strife, a pegasus named Thunder Gale has travelled to the ends of the galaxy in search of a long, lost friend of his. His search has led him to a planet where the old ways have not been entirely forgotten and evils left dormant since Celestia’s time stir once again. In order to survive the night, he’ll have to seek out guidance in the last place he ever thought of looking: the wings on his back.
Not a crossover nor an alternate universe, this is the far future and all this has happened before, and will happen again.
Cover art by Silfoe.
Now featured on Equestria Daily!

This story is a sequel to There's No Place Like Home

Since she was born, Trixie believed she would achieve greatness, but life had always conspired against her with setbacks. First, she was forced to drop out of school. Then her reputation was ruined, and next she fell under the influence of a dark magical artifact. Finally, her father was killed in a tragic incident.

Years later, the taint of the Alicorn Amulet is gone, but having felt the power of Princesses once before, Trixie hungers for it yet again, and she takes to exploring Equestria. With her will renewed, Trixie is ready to let the dice roll, knowing there will be no third chance if she fails. In Phantasia, a mare shall defy destiny.

Begins in media res. Absolutely no knowledge required out of the prequel, but one small plot point will be spoiled by Chapter 2 (Midsummer). Ignores post-Season 4. Cover Art by Malifikyse

There is a hidden village deep within the untamed forest surrounding Neighagara Falls. Should one ever journey to this village, those who live there will welcome them for a simple price: love.

When the village accepts a new family from Cloudsdale, a not-quite-altruistic pair of changeling siblings offer a young filly friendship and a chance to find her place in the strange village she hopes to call home.

New cover art done by Arcticwaters.

This story is a sequel to Princess Celestia: The Changeling Queen

This story is a direct sequel to Princess Celestia: The Changeling Queen. Reading that first is necessary to understand any part of this story.

Co-authored by vren55 and Zervziel

Alternia, sister to Chrysalis, ruled Equestria for a thousand years, disguised as Princess Celestia, while the alicorn slumbered in a healing sleep. Now revealed, Alternia prepares to become Equestria’s first changeling princess, and prove herself to the ponies she loves at the side of her co-rulers Luna and the newly-returned Celestia.

But even as the crown descends onto Alternia’s head, something is stirring in the depths of the Eastern Sea, something that will turn the surface world onto its head. Some power that could destroy Alternia, and all that she loves, before she can even regain the approval of her own ponies.

Will Alternia restore the trust her ponies once placed with her? Will she found a hive? Will she find love?

All that is certain is that Equestria, and the world, will never be the same again.

Now with a TV Tropes page.

Empress Tethys and the Kelpies Created by Zervziel

That Fantastic Cover art is by Plainoasis

Pre-read and edited by:
Blankscape,
FinalFan,
Courage Fire
Cosmic Cowboy

Vinyl Scratch had been mute all her life. She's long since accepted that. It doesn't get in her way as much as one might think.

But, when it comes to telling Octavia how she feels, there could be no greater obstacle.

Being a complete introvert, Octavia is very surprised when a strange looking girl in her music class calls her a peculiar nickname. Her name is Vinyl Scratch, and for some reason, she acts like Octavia is her best friend! Who in the world is this girl???

Edited and Proofread by the very talented Shutup868

This story is heavily inspired by my love of Dawnfade's Vinyl and Octavia: University Days and my endearing love of Japanese yuri manga.

Got featured a while back and somepony was nice enough to point that out.

For hundreds of years, Twilight Sparkle has managed to go through her life by working day and night as the sole ruler of Equestria. Sensing her life coming to an end, Twilight looks back at her achievements and believes like something is missing since the last of her loved ones died.

One day, Twilight finds some old relics with her great-great-great-great-great granddaughter with one of them being her old doll, Smartypants. Memories of the time she used to play with her favorite doll, even bringing it to life with a spell, flood her as long-buried emotions come out. It is with Smartypants that Twilight will find what she has been missing all this time.

***

Inspired by BerrryPAWNCH's Growing Pains Comic, who I thank for the permission to do this fic.

Thanks to my Editors: Darth Link 22, First Down, Chaotic Note, BronyWriter, and Socks

It all started with a simple question. "Can the portal go to other places besides Equestria?

The answer turned out to be "No, but we might be able to make one that can."

When their research is complete, Sunset and Twilight are pulled into an adventure in another world, where they meet even more doppelgängers of themselves. But their alternate counterparts may reveal some things about themselves they never knew.