Sarah Kerrigan

In any battle scenario, the cardinal sin of warfare is leaving your soldiers behind. It's even worse when these warriors are so powerful that their very existence can come back to destroy you when you least expect it. When Kerrigan, a high-ranking psychic soldier (and playable hero) in the Terran army was left behind to be overtaken and infected by the Zerg, the factions of StarCraft were never the same. Reborn as the Queen of Blades, she wrested control of the entire Zerg race, tricked the Protoss into killing one of their own leaders, infested a number of worlds and betrayed her former allies. As she eloquently put it, "I'm pretty much the Queen Bitch of the Universe."