Aeron Damphair is easily my favourite minor character in ASOIAF (I loved
the chapters from his perspective in A Feast of Crows
) so I am hoping they'll do him justice this season.
I'm not that familiar with Eccleston but I have a vague feeling he's some kind of 'name'-ish actor, though, and as such I'd suspect a bigger role like Stannis... but honestly who knows. Balon Greyjoy?