Aviator Annie
In World War II Annie was one of the first female fighter pilots. During a recon mission to investigate possible enemy movements in the atlantic she flew into an area known as the Bermuda Triangle and was never seen from again till January 1 2007 when her plane (seemingly unscathed) reappeared where it had vanished.
Due to strange happenings or divine intervention, her body never aged, she had a knowledge (somewhat clouded) of swordsmanship in the eastern style and a beautiful katana with a writing that had no earthly roots.
Her memory is blocked, though some things leak through during dreams. Not really knowing how to adjust in this seemingly new world, she applies herself to ridding the streets of Paragon City and beyond of the criminal element.
Her memories continue to elude her, but a sense of urgency guides her actions.