Celestia was a filly living on an isolated farm and harboring dreams of greatness. Chrysalis was a black goo poured out from a wound in the walls of reality and with a weak grasp on the amount of fangs one should have. Friendship happened.
Twilight Sparkle is on top of the world: she's the newest addition to the Equestrian Principality, and everypony admires her success story. Everypony? Well yes, but somebody disagrees...
When a graduate student ends up on the wrong side of Equestria. He must do what he can to survive, which basically means becoming the ultimate changeling nerd.
A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.
Princess Luna has found herself on a very different moon after some strange force interfered with her banishment. She doesn't know what the metal objects that keep orbiting and sometimes landing there are, but she's going to find out.
Not all changelings are fit for life in a hive. But that doesn't mean they're capable of life outside it, either. Join one such changeling as he tries to find his place in Equestria, and what the difference is between survival and living.
The surprise transformation from a privileged human, with a loving family and seemingly perfect life, to a changeling is a bit overwhelming to say the least.