1. Daenerys Targaryen
The Mother of Dragons will give you one chance, and once chance only. Pledge fealty to her, and you've got nothing to worry about. Betray her, and you will wish you hadn't. The silver-haired beauty may not look threatening, but as time passes she becomes less forgiving of those who wrong her. From burning witches and warlocks alive to locking traitors in an empty vault to rot, she doesn't give second chances. And did I mention she's the Mother of Dragons? All she has to say is "Dracarys" and one of her three little dragons will light you up. It is known.
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