16. Sarah Kerrigan
What Makes Her Bad: Becoming one with the Hivemind to wreak havoc on all of humanity.
What Makes Her Cool: The Queen of Blades will rip you to pieces. Believe it.
The Queen of Blades, Sarah Kerrigan, originally appears in StarCraft as a twenty-six-year-old female Terran psychic. Having trained both physically and mentally, she became a supreme agent and assassin. She was turned into a human/Zerg hybrid and became completely under the control of the Zerg Overmind. Being one of the most powerful agents, she replaces Overmind. Even after the war and having control over the Zerg, she sought to rule and have dominance over the galaxy.