I hope for none but if one had to go ...Alison :I or Rachel, cause I have no idea where they're going with her. 

Honestly Arya's arc this entire season just led nowhere. All that build-up just for her to kill a sick fuck? I feel like she's hardly learned anything other than wearing a face, and that's all. The Theon 'twist' felt so strange, but I get it. He feels he deserves his suffering but won't let Sansa be a product of Ramsay's sick joys. Petyr didn't get shit this season either, I didn't much like that, but Tommen was so WORTHLESS as a king. Joffrey would have ran those cult fuckers out of his city immediately. The only reason they were in so deep is because Cersei just HAD to beat Margaery.