A human living in Canterlot castle is given to Queen Chrysalis as part of peace negotiations between Equestria and the Hive. Celestia knew she shouldn't have let Luna finish the negotiations herself.
A rogue portal dumped Caleb into an Equestrian desert and left him stranded in an unfamiliar universe. He has to start his life anew but a sympathetic earth pony mare offers to help him learn the ways of his new world.
Princess Celestia is mysteriously taken to earth without knowledge of how it happened. Meeting a human, Alex, he takes care of her until a fore mentioned portal opens once more to bring her back.
Taking care of a whole kingdom can be hard, teaching/learning how to act in the modern times is harder. Keeping up with Twilight is tiring, dealing with their nephew is worse. Thank Faust for their new butler.
After his 'encounter' with Princess Celestia in the throne room, 'Anon's' life had come to a bit of a lull. That quickly resolves itself after a misunderstanding and a timberwolf attack leads him back to Canterlot. Shenanigans, and drama, ensue.
After an urgent summon from Fancy Pants, both Celestia and Luna attend Day court. However, a new precedent is set when Fancy Pants presents a male alicorn to the two princessess, one he found dumpster diving behind his house...
When Princess Luna returned, the thousand years of banishment was a blur. It was merciful, in a way. Everycreature she once knew was there one minute, and gone the next. One stallion wasn't so lucky.
A man wakes up to find he's inhabiting the body of a cartoon horse who wasn't exactly Mister Popular, judging from how shocked the locals are when he says things like 'please' and 'thank you'.
Princess Luna sets up the greatest prank in Equestrian history. She bribes her sister's most trusted doctor to tell Celestia that she has a few days to live. After finding this out, Celestia is determined to live life to the fullest.
A bored pony sets out to meet his most admired heroes: Twilight Sparkle and her friends. That is, so he can introduce himself as a villain and fight them. For fun, of course.
Anonymous leaves Ponyville to pursue a quiet office job in Manehattan. While he finds the possibility of new love in his future, he finds that his past from Ponyville isn't willing to give him up so easily.
When Twilight is thrust into a world of horrifying abominations, terrors she can't begin to imagine, and a never-ending fear of what's behind that corner, she's forced to survive in a world which wants nothing more than to see her die.
Kenneth is your average everyday person, all up until he was tossed off a boat and into an insane asylum. Unable to speak nor learn their language, ken decides to stick by the only two ponies that he can communicate with.
After a wild night out on the town, Jay decides to go back to Pony-land for a quick visit. Things don't go quite as planned though as he finds himself trapped in a dimension full of colorful ponies and friendship.
After being shot, I ended up in a new world and eventually found love with one of its inhabitants. But Fate had other ideas in mind for our fledgling relationship...