Instead of being killed in the cold Antarctic by Dr. Manhattan, Rorschach finds himself rematerialized in a strange new, pony filled world. He finds himself drawn into the lives of the ponies of Ponyville but some ponies fear that this sociopath will bring danger and darkness to an otherwise peaceful existence. Will the mane 6 help Walter Kovac find peace within himself or will he bring them all down with him in his cold views of reality and existence?

As Seen on Equestria Daily!
And our TvTropes page (By Crowrob0t): http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/RorschachInEquestria

My Little Pony: Friendship is Magic and its likeness is owned by Hasbro Studios. Rorschach and Watchmen are owned by DC comics. All rights go to their normal original, intended owners.

Don't expect quality from this fic.

Being a creator means creating your own world, where you pour your love and heart into it.

In a stormy night, after a strange event in her office, Lauren Faust gets teleported into the magical land of Equestria. The land... that she created. What will she do now? How will she return to the reality from her own imagination? Will she even be willing to leave?

Be Awed and Amazed by the tale of Sweetie Belle as she traverses the multiverse in search of her lost mentor and friend, Twilight Sparkle! Will she find her in post-apocalyptic Equestria? Or maybe in a strange world where everypony is the wrong gender? Or even where a Pony claims to be a human? Read as she journeys through very familiar worlds you might have read about... if you dare!

At this point in time all the main worlds to be visited have already been chosen. Thank you all for the suggestions, and I hope you enjoy the surprises!

Here's the official TSC:F Music Intro: The Sweetie Chronicles: Fragments

WDTP: S2/3-CE
You can also visit the TV Tropes Page which has spoilers!

Heroes. Not many can be called as such, but every world has them. They also have their villains...and monsters. This is a tale of one group of heroes meeting another, and see if they can be more than a team--than heroes--and become friends. Discord has reached far beyond the confines of his stone-encased prison to offer the peaceful world of Equestria to two of the most dangerous villains ever known. The maniacal genius of Doctor Eggman joins forces with the mighty Koopa King Bowser to plunge the new-found world of Equestria into chaos. The Princesses of the Moon and Sun must muster all of their immortal strength to defend their realm from the tyrannical duo. If that should fail, Equestria's last chance falls to the Bearers of the Elements of Harmony...but their power--and friendship--is untested against dark forces from another dimension. But hope comes from a band of heroes: legendary warriors from different worlds who have assembled to fight as one against long time foes and would-be oppressors. Will Video Game's Mightiest Heroes arrive in time to assist the Bearers of Harmony? Or will they be too late?

Or their combined power not enough?

There is a legend. A legend of six heroes destined to protect Equestria from danger. But these six are not the Elements of Harmony. They are more.

The Steadfast Commander.
The True Genius.
The Vigilant Eye.
The Merciless Wrath.
The Fighting Spirit.
The Lone Wolf.

They are the true Protectors of Equestria.
They are the Guardians.
They are Noble.

Alright, so here is the story I have teased on my blog, The Noble Guardians! If you already guessed the concept, good for you! But for the rest of you, this is a Halo: Reach Crossover. I have seen a couple fics in which Six or Jorge are brought to Equestria, but they were always alone, so I decided to bring them all together as one. This will follow the show's storyline, with Noble acting as additional characters to the episodes, but don't worry, I guarantee they will be major characters with their own arcs and there will be plenty of original situations. I will also most likely skip any episodes in which Noble would have little to no involvement. (This will be few and far between, one example being "Call of the Cutie" I mean, even the Mane Six are only minor characters in that episode. I'll probably either mention those in passing or have another story going on with those episodes occurring in the background.) Anyway, see how Noble reacts to becoming Equestria's destined protectors!
Cover image credit goes to Gekko3309.
Naturally, this story contains spoilers for Halo: Reach

Twilight Sparkle wakes up one morning to a harsh dose of unreality. She is stranded, without her friends, on an island which matches no known locale on Equestria. Surrounded and harried on all sides by the alien and the dangerous, she will find her mettle sorely tested, and find perhaps that the best friends you will ever have in your life are the ones you make when your back is to the wall...

Thanks to CedricBale and noobie56xx for tracking down the name of the artist so I could give them credit.

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

Princess Celestia is a living legend, but much of her life is shrouded in mystery. Records have long since been lost to the decay of time, and the tale of her triumph over Discord has become a fable. The Princess's memory of the event has long since faded... or has it?

Her faithful student lending an eager ear, Celestia recounts the true story of a war-torn Equestria, the struggle against Discord, and the early years of her own life.

Before she was the Princess of the Sun, she was merely a stranger.

(Featured on Equestria Daily!)

Inspired by the heroics of the mysterious mare known as the Stable Dweller, Silver Storm, a guard of the town of Marefort, decides to go on a daring mission to rescue her captured brother. Of course things rarely go as planned and her attempts at heroism drags her into a tangled web of plots and conspiracies as warring factions vie for control over the last great city: Dise.

Spanish Version translated by Spaniard-Kiwi: https://www.deviantart.com/spaniard-kiwi/art/Fallout-Ecuestria-Heroes-996263393

This is pretty much a self-insert, mostly done for comedic purposes.
After a mishap with an invention of mine, a friend and I find ourselves in the magical land of Equestria. How will the peaceful land of Equestria handle the influx of two humans? Will Jay and I ever find a way back home? Will anyone give this story a fair shot? Read and find out.
Things that actually involve MLP:FiM begin in the second chapter.