A subtrope of Pintsized Powerhouse. Often used by the Action Girl, Faux Action Girl, Hot Amazon, Little Miss Badass, and Lady of War. Very common among characters of the Mary Sue variety. Compare to the Cute Bruiser who uses a completely different style of combat. - tvtropes.org
see Babydoll in Suckerpunch, River in Firefly, Chun Li in Street Fighter: The Legend of Chun-Li
"Yeah, she used some beautifully choreographed waif-fu."