Pandinus Imperator (You can call him Pan, he won't mind) is knocked back in time during the Canterlot Invasion, and accidentally kills King Sombra on arrival. Instead of being executed, the changeling is surprised to find himself being hailed as a hero, and is promptly put on the throne as the new monarch, the Crystal Emperor. However, Pan now faces a great many problems, among them Celestia and Luna, who seem certain that the changeling is secretly up to no good, as well as several political factions secretly plotting to undermine his reign. There's also the tiny problem of the constant snowstorm that threatens to cut the city off from the outside world permanently.
The Crystal Ponies need a hero now more than ever before. Why did they get a changeling instead?

We Has A TvTropes.

While not truly a part of Bucking Nonsense's Changeling-Verse, the same rules regarding changeling abilities and society apply.

Cover image provided by gabapple, used with permission.

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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This story is a sequel to Dash of Humanity

I'm stuck in Equestria, which reminds me of the dark ages. Instead of internet and fast-food, I have Rainbow Dash. She's been asked to help me learn to fit in... I'd like a refund.

I suppose we got off to a good start, aside from being told that after all I'd done I'd never see Earth again. So long as I can look on the bright side of life, and not get arrested for running pranks on everypony with Dash, I might just survive long enough to find my purpose in Equestria. So help me, however, if I get any vegetable related cutie marks I will choke a Princess.

Cover Art by JinZahn
Sequel to Dash of Humanity
Edited by: Selbi, Abcron, Cassius Litner, Seven Fates,
Refro, BronyWriter

Equis has a new Death, a new reaper of souls... Only problem is that this one still has obligations in the world of the living.
How will Aergad deal with his new task and old promises? Will Pipsqueak really learn magic under his guidance and how will the paladin fare on her mission in the ruins of Blackshadow Reach? Most importantly, what will become of the planned marriage?

This is the sequel to Souls Apart. You may want to read it if you want to know what's going on.

Two enemies wind up in Equestria due to a major mishap. Will they come to terms with this world? Most importantly, will they be able to put their old feud aside to survive?

Stranded on a hostile, alien world, Twilight Sparkle and Rainbow Dash must depend on one another and a fellow alien castaway if they want to return home to Equestria.(originally published on FFN)

The war has gone on for far too long. To end it, Celestia just has to sign the treaty.

Go read the comments. They're way more interesting than the story itself.

Now with an audio version
Now translated into Russian and with an audio version.

Celestia thought that the next two weeks were going to be a nice get together with her niece and her sister, no irritating nobles, no magical end of the world nonsense, and most importantly, no Blueblood.

She did NOT expect a weird creature calling itself the Cuddle Bandit harassing her. Now Luna's in love and Cadence can't stop laughing.

.... Why can't her vacations ever be normal?

Thanks to Tstyson, MasterFrasca99, Astrocity, and Procket12 for all of the stuff they did.

A watchmen-ish silly fic by a silly, silly author. If your looking for a story with a plot or one that is well-written then read this one.

And nope, I'm not being sarcastic....

No, really...

Have you ever woken up as a vegetarian cartoon pony? I have, and she won’t shut up about it. I’m stuck in her body as our minds swap control and our memories blur. I can’t seem to do anything right, and it’s even worse when she’s in charge.

Now, we’re in a back and forth war for control of her body. I just want to eat meat again, and have a little personal space. She’s convinced I’m hitting on her friends and trying to score. I’m not sure I can survive the rest of the day, let alone until we fix this.

Edits by: Selbi, Abcron, Breath of Plagues, Refro, Jaestring, The Parasprite, Starbound Gurren
Pre-read by: SkeeterTL, Solidfire, Penjacker, TypewriterError, Pearple Prose
(It took all of them to corral my insanity.)
Cover art by Tsitra360
V1.1-Rated teen sex for strong innuendo.
V1.2-Pinkie Pie now enforcing RIAA guidelines.

Living in Equestria under a false name and racial identity is one thing. Finding out you're not the only one of your kind stranded here is another... especially when that someone and the element bearers are looking for you.

Being my first attempt at a first-person romantic comedy, this takes a slightly different approach to the concept of being a human stranded in Equestria.

Enjoy.

Big thanks to DVAN56 for editing. Go check out his work!