(9)Asha Greyjoy - Call me mad, but I don't really like Jon that much. He's a bit of a clichéd hero, and while he's smart and cool to read, he's not exactly a compelling character. As it turns out, though, I rather like Asha! (Still expect Jon to win, though).
(4)Varys - No questions there. Varys is a very engaging character, and Mel is a bit stale.
(3)Theon Greyjoy - Oberyn is fun, but Theon's one of the objectively best characters in the series (not a favourite of mine, but you can't deny the complexity)
(2)Catelyn Tully Stark - I don't really like Catelyn, but Syrio's little else than a one-scene wonder. An awesome one-scene wonder, mind you, but Cat still edges out the win anyway.
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When you have nothing to say, quote yourself ~ Solfadore