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Her name is Nympha, Princess of the Changelings, and not QUITE an OC, since if you follow the headcanon I'm proposing here, the Cadance Twilight rescued and Shining Armor married was Nympha all along.
It always puzzled the heck out of me that the changeling queen, a creature that lives exclusively through deception, would so blatantly announce her goals as soon as her ruse has been called, and that's not even touching on how Twilight was even starting to believe she was wrong about Chrysalis until she trapped her with Cadance.
So what if the trapped Cadance was also a changeling? Sure, she knew the Nursery rhyme that Cadance taught Twilight, but the first thing Twilight did in front of Chrysalis was that entire nursery rhyme, with full dance routine attached. How hard would it have been to pass that along to Nympha once Chrysalis decided her cover had been blown and that a fallback plan was needed?
Now the obvious question left over is how Nympha managed to do the whole love recharge thing for Shining Armor, in order to blow away the other changelings, if she wasn't the real Cadance? Well, I have a whole multichapter epic still spinning in my head to address that issue, but the short answer is; she may not be the real Cadance, but she really DID fall in love with Shining Armor.
Of course this still leaves the obvious question of "where the fuck is Cadance then!?" It also has an obvious answer when you consider that Changelings feed on love, and Cadance's talent is specifically creating love. I think she might wind up getting her name changed to Cornucopia.
