Badass Ladies of the Twilight Universe: Tanya, Siobhan and Zafrina

The dramatic cast of characters introduced in the final book of Breaking Dawn* are so numerous that a chart is included at the end of the book sorting them out into their respective covens.  However, the three women I've cited here (in addition to previous Badass Lady Kate) are standouts even in their relatively brief appearances.  Each acts as a leader/spokesperson for her majority- or entirely-female coven, providing a contrast to Volturi and the Cullens.  Their powerful roles also specifically play into what I see as a theme of sisterly love and trust that runs through Breaking Dawn - Bella has to place serious trust in both of her new sisters, asking Rosalie to shepherd her through her dangerous pregnancy then following Alice's cryptic instructions after her disappearance, the Volturi deliberately manipulate the sisterly bonds of the Denali coven to try to incite a fight, and the story of the Amazonian hybrids that Alice brings in to avert violence centers around sisterly love.  It all fits into what I read as a world of strong women who love and defend those about whom they care.

*I couldn't find an all-encompassing quote, so I just left it without one.