For AGoT, Arya and Dany have my favorite chapters. In A Clash of Kings I would swap out Dany for Tyrion and Davos, but that is beside the point. Arya had the most heartbreaking chapter I had read up to that point towards the end of the novel. Her very last chapter, where she is roaming through Flea Bottom. It wasn't even the big event of that chapter that led to this depressed state (I pretty much saw that coming), it was simply the description of life in Flea Bottom and the things Arya had to do and think in order to cope with it. My mind was blown, and not in an entirely good way.