If you've read my review of 300: Rise of an Empire, you'll see that one of my biggest areas of disappointment was the characterization of Eva Green's Artemisia, based on the historical female Persian admiral Artemisia I of Caria. She had the potential to be an awesome character, but the way they handled her not only weakened Xerxes (the primary villain of the first film) and made her too overblown, but also clashed a whole lot with the historical figure she's based on.