20. Oberyn 'The Red Viper' Martell
He's sexy (and serpentine) – and he knows it. He's Prince Oberyn Martell of Dorne, the bisexual brother of the southern region's timid ruler, and his lust for life and skill for killing alike made him a breakout star during Season Four. Actor Pedro Pascal invested him with an intelligence and warmth that kept him from getting cartoonish, making his skull-shattering death at the hands of the Mountain one of the show's most shocking moments.