Part 1: Lyra's Pyro Predicament
Part 2: Twilight's Demoman Devastation
Part 3: King Sombra's Robotic Retaliation

When a mishap causes two para-dimensional weapons to colide with one another, RED Team's Pyro is sent flying from the Team Fortress 2 universe into the alternate universe of My Little Pony, where he is almost instantly discovered by Lyra, who shelters him in her home.

Having him hidden in her small townhouse isn't easy; keeping him from setting things on fire, teaching him that not every cart that passes by is cause for alarm, and that blue ponies are not something to be suspicious of.

However, with Nightmare Night soon approaching, Princess Luna feels that there may be something more sinister riding on the coat tails of Pyro's grand entrance; the first human to ever set foot in Equestria some thousand years ago...

2022 REWRITE IN PROGRESS

After being rudely awoken from Cryo-sleep, John-117 finds that the Forward Unto Dawn has been sucked into a gravity well, causing it to fall towards an unknown planet. In the crash, he is separated from Cortana and falls alone into the Everfree forest. In addition to this new complication, old memories from a scarred and tragic past haunt his dreams, putting his remaining sanity on edge.

However, he has little time to ponder these thoughts, as he encounters the planet's... peculiar... inhabitants.

First 19 Chapters proofread by Bravo 539 and Shadownamesto.
Credit for the intro sequence goes to Blaze Spectrum.

Current rewrite will not necessarily follow the old story but certain events and details may be reused.

Toby "Tobuscus" Turner is transported to Equestria when he presses a rainbow colored button, will he make friends or will he be evil. Neither, he shall be Tobuscus. And if It's Tobuscus it means stuff.

Humans.

Truth or myth? Ancient lost civilization or just an old pony's tale?

No pony has ever seen one, and most haven't even heard of them. But Lyra knows that these wonderful creatures are more than just old legends, and she's going to find out... and possibly drive her roommate insane in the process.

“The law of great numbers states that it is possible for there to be many universes that don’t even have magic, ponies, dragons nor anything else that we find utterly normal in our world.”

Studious unicorn Twilight Sparkle is always reading. However, one book she reads leaves her thinking about alternate universes. Could there really be an infinite amount of other universes out there? Armed with knowledge and magic, she is ready to find out!

But nopony is ready for what she discovers.

Thanks to my editor Frenchie for fixing my many, many mistakes!

While trying out to play at the Canterlot Garden Party, Octavia sees Vinyl Scratch with her turntable and rap music. Octavia automatically hates her. She soon is surprised to learn that the two of them have a lot in common. More in common than Octavia thought. Octavia is surprised to discover she becomes friends with Vinyl. But will spending too much time with this new pony change Octavia? Will she still be the sophisticated, classical-music loving pony when the Canterlot Garden Party comes?

Cover picture is from http://bigmacintosh7.deviantart.com/art/Octavia-VS-vinyl-scratch-295289327

Something I just couldn't get off my mind until I wrote it down. Be warned: the ponies in these battles really go off on each other. Almost exactly like it is in "Epic Rap Battles of History", except with less cursing. There's plenty of verbal bashing, though.

Vinyl Scratch is the DJ for most of these battles, and will be doing the all-caps commentary (except for the ones she's in, of course). OC tag because of slight self-insert.

I've heard that this story is better when read with someone else. You know, with each person doing one half of the rap battle?

List of Rap Battles (as per request)
#1: Twilight Sparkle vs. Rainbow Dash
#2: Pinkie Pie vs. Rarity
#3: Spa Sisters vs. Flim Flam Brothers
#4: Octavia vs. Vinyl Scratch
#5: Angel vs. Gummy
#6: Derpy Hooves (Ditzy Doo?) vs. Lyra Heartstrings
#7: Princess Luna vs. Discord
#8: Scootaloo vs. Pipsqueak
#9: Fluttershy vs. Screwball
#10: Apple Bloom vs. Diamond Tiara
#11: Trixie vs. Featherweight
#12: Silver Spoon vs. Spike
#13: Sweetie Belle vs. Queen Chrysalis
#14: Applejack vs. Carrot Top
#15: Bon-Bon vs. Lyra Heartstrings
#16: Twilight Sparkle vs. Rainbow Dash (rematch!)
#17: Big Macintosh vs. Shining Armor
#18: Iron Will vs. Photo Finish
#19: Gilda vs. Prince Blueblood
#20: Nightmare Moon vs. the Doctor (Doctor Whooves)
#21: Princess Celestia vs. Princess Luna
#22: Snips and Snails vs. Twist and Ruby Pinch
#23: Braeburn vs. Soarin'
#24: Zecora vs. Cheerilee
#25: Winona vs. Opalescence
#26: Derpy Hooves vs. Pinkie Pie
#27: Spitfire vs. Daring Do
#28: Princess Cadence vs. Queen Chrysalis
#29: Babs Seed vs. Lightning Dust
#30: Sunset Shimmer vs. Trixie *
#31: tba

Picture by Silversnow here on this site.

...should there be a 'sex' tag, considering some of the stuff brought up in the rap battles?

After a summoning spell goes awry, Twilight somehow manages to bring three of the biggest badasses in gaming history into Equestria. After trashing part of Ponyville in an impromptu brawl, they are brought to Celestia. What could possibly go wrong?

Crossover with Fallout: New Vegas, The Elder Scrolls V: Skyrim and Mass Effect.

When Octavia and Vinyl Scratch decide to combine their respective musical styles into a new genre that will celebrate not only their talent, but also their unique bond, they feel confident that they're the pioneers of the new age. So when the two find their music challenged by another pair of musicians, they set out to make sure that theirs is the best. However, the rival two aren't bad artists themselves, not to mention they’re certainly not… of the same persuasion as Vinyl and Tavi. In the snow-wrapped streets of Manehattan, can they risk exposing their new found -and still taboo- relationship, or will they be doomed to second place?

Incredible cover art by JackiePhantom13! DA: http://jackiephantom13.deviantart.com/

EQD!!
Link: http://www.equestriadaily.com/2012/04/story-mixing-relationships.html

It's 2 years after Rainbow Dash was sent back to Ponyville. Princess Celestia wiped her memory for good... or so she thought. After a nasty accident, Rainbow Dash starts remembering her past. She finds an unoticed box in her attic. Will her friends be able to destroy the memories of her father? And will she ever see him again?

NOTE: I do not own the story 'My little Dashie'. This is a fan fic for a fan fic I guess. Please, constructive critisism again if possible. I really want to improve my stories as much as possible! :D