Carol: Like Thor, her powers line up with Fire/Air. But... AIR! AIR! FREAKING AIR!!! This is a woman completely obsessed with flying, to the detriment of her health. Air!

Mary: Definitely Earth.

Stiles: Hmmm. I could make an argument for either Water or Fire, and Teen Wolf already haphazardly tries to use elements symbolically. Probably Fire. Especially given his canonical habit of, um, burning people.