ponysona

Noun

 * 1)  A pony alter ego or self-insert character created by a fan.
 * 2) * 2013, "Naked As A Jaybird", "Brony Porn 4 Lyfe", The Muffington Post (satirical newspaper of the University of Alberta), 17 April 2013, page 13:
 * My ponysona is Heartbeat Bubbles, and she is red and green and follows Fluttershy around and is kind to all animals.