My Little Pony: Fighting is Magic is a freeware indie game made for bronies, by bronies. The game, which is still currently in development, will boast a 17-character roster when complete. The list list will include one non-pony, which I assume is the baby dragon, Spike.
The first official release will include: Applejack, Twilight Sparkle, Rarity, Rainbow Dash, Fluttershy, and Pinkie Pie, the remaining 11 will be added with DLC. I call dibs on Fluttershy, by the way.
My Little Pony: Fighting is Magic has no legal ties to Hasbro, the owners of the Pony IP. It's being developed by Mane6 and will be free when it's released on the PC. I will personally keep you up to date on this title!