A hot-tempered human was turned into a Nightmare from the game Heroes of Might & Magic 5, and then transported to Equestria.

After her defeat in Canterlot, the force of love blast send Chrysalis to a new planet, Earth.

There was a young boy who became a God once. Many years have passed since that, and like any God does, this one becomes bored. Fortunately for him, Equestria is a place where he is not a God.

Mission was simple enough: to get into the Null-T portal, teleport to Escobar, then help to defeat Velian there and return. But things can't go right with portals, can they? Echelon: Wind Warriors crossover.

Fall comes after Summer. And with the fall, the dead rise. Can Sergey, a russian guy in his late teens, save himself from death? Fortunately for him, he will be aided by those he never thought about and never expected to be.

King of fearsome vampires returns to the world of living. Twilight and her friends are to stop him from doing whatever he's up to.

A wizard from Earth messes up a teleportation spell by accident and gets teleported to Equestria with no way of going home. What will he do in the strange new world which technology is far more developed?

Sombra, after failing his mother the second time, turns into the shadow of his former self. Accursed, abandoned, with no friends to help him, what will the former King do?

A cyborg assassin from the future finds himself in the land he has never seen. What can possibly NOT go wrong?

His name's Moonbeam, and he's a cyborg who never asked for this.

The undead being returns to the world of living.

A new pony moves to Ponyville to study in the school.