(1)Tyrion Lannister - Tough draw for Ramsay, no question. As Solfadore said, he's a wonderfully despicable villain. But yeah, this is Tyrion frickin' Lannister.
(5)Davos Seaworth - Toughest match of the round by a ridiculously long stretch for me. Littlefinger is one of my favourite characters, he's so intriguing, everything he does is just perfect for his character archetype. He starts as a nothing heir, charms Lysa Tully into getting her new husband to give him a position and then immediately his talent takes him through to the King's Council; from there his intrigue skills move him up even further so that, by the end of the fifth book he's Lord of Harrenhal, Lord Protector of the Vale and is fostering what is, as far as he knows, the rightful heir to the North. And he's an absolute creep. You can't help but hate and admire him for the way he's brought himself up from nothing. Davos has also brought himself up from nothing, but where Littlefinger did it all with chicanery, intrigue and backstabbing, Davos has done it with loyalty, honesty and consistency, all the while keeping a very strong sense of right and wrong. All that's taken him from a smuggler to a King's Hand. His lack of presence in the last two books has been a shame, but it hasn't changed my love for him. He is my favourite character, and I know that if he does win this game he'll be fed to Tyrion but if it was up to me he'd win the entire competition. And he's been played brilliantly in the tv series btw.
(3)Sansa Stark - Brynden is a fantastic side-character, but he just doesn't matter enough (Although there's definitely time for that to change). Sansa's character growth has been brilliant so far, and when it's finally fully-realised to its conclusion I think people will be a lot kinder to her.
(2)Cersei Lannister - Kevan's awesome, but the main reason he's awesome is because he verbally *****-slaps Cersei. Kinda says it all I think. Cersei's borderline-madness is fascinating, simply fascinating.
EDIT: Bolded my choices since it was kinda wall-of-text-y
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James - Board 8's Resident Warm And Safe, Slipper-Wearing User
& The Cream of Porcupine Tree Fanboyism