In the alternate timeline where Sombra was not stopped, a human finds himself suddenly in Sombra's body... just after the dread tyrant has conquered Equestria.
Colonel Roy Mustang arrives in Equestria pursued by the demons of his past, the Homunculi Lust and Envy. Getting back home won't be easy; rescuing Equestria from transmutation will be much more difficult. Fullmetal Alchemist: Brotherhood crossover.
When Rainbow Dash wakes up in a strange land with no memory of who she is or how she got there, it's up to her and some new friends to try and uncover her past, and find out just what exactly she was running from.
I myself, am an amateur scientist, so naturally when offered to go on an expedition to take samples from an active volcano I accepted, although falling in and waking up in a new world as a burning horse no less was not what I was expecting.
From one barren wasteland to another, less barren wasteland, an Australian IT worker finds himself stuck in the snow where nowhere to go. At least it can't get any worse... right?
A simple Tunneler drone is catapulted from Equestria during the infamous Wedding onto earth. Confused, injured and alone, the drone must figure out how to survive with the whole world watching. (Changeling on Earth, Xcom, Men in Black and SG:1 Xover)
After an accident involving one of Starswirl's objects, Luna gets turned into a stallion. She'll have to contend with judging nobles, romantic mares, paparazzi, and her obnoxious sister in order to find a way to turn her back.
For hundreds of years, Twilight has done amazing things, but has always felt something missing in her life. She finds what that is when she rediscovers an old friend.
Right before the Elements struck, the Nightmare unleashed a spell out of desperation. A substitution spell. Otherwise known as the correct use of Kawarimi.
After being banished, Nightmare Moon finds she is able to talk with Discord, also sealed away. The two despise one another, but talking with a hated foe is better than endless monotony. Over time, the two fall in love, up until tragedy strikes.
After traveling into the Bermuda Triangle following a vision, Magnus ends up in a place filled with fairytale creatures and a secret concerning his lineage.
Almost a year after Celestia's great crusade against necromancers concluded, Mortem discovers a rather large army outside his castle. Not wanting to cause an incident, he works towards a diplomatic solution.
Paul Werner—a Colonel in the German Army—was deposited in a world vastly different than the one he was forced to leave in 1943. To him, that's the best part. Unfortunately, parallels of his past world refuse to die. One of them, is named Aryanne.
A particularly stubborn human is lost in Equestria and is trying his damnedest to find a way out, while surviving the surprisingly difficult rigours of life in a land filled with cute talking animals. Hilarity ensues.
Twilight Sparkle failed her entrance exams for Celestia’s school. Worse, she is a danger to both herself and others, resulting in her magic being suppressed. Dreams crushed and now one of the weakest unicorns, a nightmare comes to her.
[Breath of Fire 3 x MLP] Human becomes his favorite game character and was thrown into Equestria. After escaping Celestia and Luna, he finds out how hard it is to live for so long beyond a human's lifespan.
Looks like dad wants to head to South America, wopty do. Ever since mom died, he has taken me on his not so exiting artifact hunting trips. Well turns out, things happen this time. I stumble across some old ruins, solve some puzzles, and then ponies.
A young man decides to attend a convention with his friends dressed as his favorite character from the Fire Emblem series. Next thing he knows he's in Equestria.
Jason's life has grown dull. After months of living in Ponyville, he can't shake the feeling that there is a void in his life. Then, one day, as he watches a family play in the park, an idea sparks within his mind: why not adopt a pony of his own?