Game Of Thrones: 9 New Characters Set To Appear In Season 7
9. General
Description: General, in the age range 40 – 55. "He’s a senior military officer, and they’re looking for a white actor who uses the British RP accent. The actor is needed for the week of September 6th."
Who It Could Be: White and speaking Received Pronunciation means this is a character based somewhere in the South of Westeros, most likely King's Landing - perhaps someone recruited by Cersei as she sets about imposing her rule. Since a huge number of characters were killed off there, it wouldn't be that big of a surprise to see them start adding in a few new ones, and she'll be needing people to help command the army, especially with the incoming threat of Daenerys.
If this is a general for Cersei, it begs the question about where Randyll Tarly will fit in this season. It'd be good to see him step up and show why he has such a fierce reputation, though he may be staying loyal to the Tyrells here. The other alternative for this general is that he's someone employed by Olenna Tyrell to help Daenerys, a military figure who knows Westeros, but you could use Tarly for that, and then the new general on Cersei's side.