You'll probably find better help over in the Comics/Cartoons section of the forums. That's where you'll find other MLP threads and cosplayers.
'Idiot's Lantern' Rose Tyler (Doctor Who)
Astrid (How to Train Your Dragon)
Tinkerbell (Peter Pan)
Reviving This Year:
Annabeth Chase (Percy Jackson)
Katniss Everdeen (Hunger Games)