The all-white, incredibly temperamental witch of Left 4 Dead fame is terrifying.
She often feels unavoidable, especially if you're playing online with hyperactive, trigger-happy teammates. The echoes of her haunting cries still terrorize my dreams occasionally. (Seriously, I play *that* much Left 4 Dead.)
She's a little less threatening in these cosplay images, though. At least while she's stuck in the frame and not chasing wildly after you. Does someone have a molotov handy just in case?