I thought of a few things that would make for an interesting FimFiction story, though I doubt anyone would do it. I would do it myself but life gets in the way and I don't think it'll be very good. Lol, hate is hate no matter where you go, y'know?
First Idea:
Starcraft crossover with FIM
Jimmy Raynor: Big Mac
Kerrigan: Smarty Pants
Command Cyborg (Apparently they're called Adjutants): Applejack
Tassadar:Twilight Sparkle
Zeratul:Rainbow Dash