there was a young woman from boobville ...

Police Sgt. Karrin Murphy from The Dresden Files book series. She is tiny, fierce, firm in her convictions and dosen't take shit from anyone, human or not. That, and she beats the crap out of things larger and nastier than her on a regular basis. That being said, she is still very human, prickly and slow to trust. Once she gets there, though, she'll stick by her friends and allies unto the bitter end.