Her name is Brunette Nuclear, AKA, Bombera. In the land of your hometown, you were walking on the sidewalk, minding your own business, until you see a large explosion from the nearby building from a couple blocks ahead. A young woman comes out of the entrance dropping some thugs to the floor with a huge smile on her face.

Bombera: "Sorry! I may have used a bit too much bomb power. Teehee!"