Great lists! My cravings to know more are set on:
1) Benjen Stark. His personality and then disappearance got me hooked when first reading the ASoIaF series. I'm also a true crime junkie, and it tickled that spot in my psyche. Maybe it won't be good news, but bugger it-- where is he?
2) Anything-- ANYTHING-- more about Bloodraven. Please. I'll take anything from the pen of GRRM about Brynden Rivers.
3) Any and all of the Mormont women, especially in connection with Robb's will and a possible GNC.
4) Roderik "the Reader" Harlaw. I don't know if there is more to him, but again, I'll take what I can get. He may simply be a lone voice of reason, but he was so likable yet crusty. I'd love to sit in his library with him.
5) Marwyn the Mage. How could anyone NOT want to know more? Thankfully, I believe we will get more but I can't wait, am counting the days.
6) Yes please, anything Dayne. Fascinated, need more!