Draco in Leather Pants: Really, fanboys/fangirls? You're going to rewrite a character JUST SO your OTP can happen so you can have wetdreams about two hot men/women screwing each other's brains out? Pathetic.
Wangst: Quit your whining and do something about it instead of just feeling sorry for yourself. Is that too hard? Or are you going to be a huge drama queen about it?
The Load: Unless you clearly justify and or make the character who falls under said trope get better then I will view the character as The Scrappy no matter what.
Designated Love Interest: This is a big one for me. It's doubly effective if there's a love interest that I like because I like their personality better or I completely dislike the canon love intrest.