15. Molly Weasley
A complete danger when she is defending her family, Molly single-handedly took down that b*tch Bellatrix and made the world a much nicer place in the process. All despite being presented as a comedic character and mother figure to that point. She has always been an active witch but The Deathly Hallows show that one person can only take so much and when family is threatened, it's guaranteed that there is a Molly Weasley inside every woman. And the fact that she bests Bellatrix in open battle proves why that's a great thing.