Sailor Moon
An ordinary girl who meets a talking cat that reveals her destiny as a magically empowered protector of Earth. Ridiculous costume changes ensue.
Where is she from?
Sailor Moon is the insanely popular title character in the japanese anime series of the same name, which is basically the great granddaddy of magical girl anime. There have been a few live action versions of her, and we can explore them here:
Comic Appearances
GND 039 - Gip the Goblin brings Christine a costume from Erik, which she tries on at Sarah's urging. They're both a little skived to discover that it's a Sailor Moon costume.