Let's Build a Yeti-wench

Over the next month or so, there are try-outs for the next season of Who Wants to Be a Superhero. It's too late to get things together for this time, but I'd like to plan ahead for next time around.

So far all I have is the name. I need more - costume, power/s, weakness/es, source of powers, backstory. My nonsuperhero identity isn't that interesting, so the superhero ought to be. Any contributions welcome.