User blog comment:Thereselovesyou/MMA Fighter Conor McGregor Cast in Mystery Role/@comment-5014364-20161209181431

He's apparently a member of Euron Greyjoy's crew on the Silence.

I suspected he's their analogue of Cragorn - who in fact, appeared in the Season 6 Histories & Lore videos (I screencapped him).

However, I presented this to WatchersOnTheWall.com, and they told me that from production sources, "he isn't Cragorn".

I don't know what that means, exactly. He may be loosely inspired by Cragorn in the books, or perhaps, a mashup of several members of Euron's crew and lieutenants from the novels put together (which is fine).

Let's just hope he's not a member of House Codd (shudder).