Awesome, copslay ideas! I love Applejack as the engineer and it looks vaguely familiar. Think my husband has played that game?
LadyLockette has great ideas for Queen Chrysalis. I want to add maybe some halloween vampire fangs. The wings could be some of those popular fairie wings and just make some holes in them. Or dragon fly wings, they look a lot like those.
I've always thought of cosplaying Fluttershy, especially one of her outfits. Just get some temporary dye for my hair, wear it in front of my face. Then I have a really pretty green skirt and I am still figuring out the top. Would have to find a butterfly necklace or the like. X3