Hmm...such a hard question, LF, Varys, Arya, Syrio, Tyrion, Mance, Davos, Egg, Brienne, Doran, Tywin, Aemon, Sam, they're all so intriguing. But I'll have to go with Arya, I'm always looking forward to Arya's chapters the most. And amongst the non-POV characters: Varys, awesomely Machiavellian like LF, but a little more mysterious, and a little less pedo.