Ok, So Mark Sheppard is one of my favorite genre character actors. He has appeared in Supernatural, Dr. Who, Warehouse 13, Firefly, BSG, ST: Voyager, Sliders, etc.
Who could he play in future episodes/seasons of Game of Thrones?
My vote is for Halden Halfmeaster. A bit of a snarky quircky character, as well as I'd love to see him pit wits against Tyrion...
Any other suggestions?