Karl Pushmann say's it's the High Sparrow:
Never has an ascent been more rapid or godlike than the High Sparrow's. He rose from shoeless floor scrubber to shoelessly staunching out the King and arresting the Queen in no time at all. As he is leader of the church, there's not a damn thing anyone can do about it.
He's seized this power without marching to war, burning his kin or causing too much of a fuss. In fact he pretty much just bumbled into his current position as the most powerful man in the Seven Kingdoms after being gifted permission to create an autonomous military unit of religious zealots by the scheming Cersei.
This is a decision she now has plenty of time to rue because he recently did the unthinkable by beating her at her own scheming game. Then, for good measure, he threw her into his filthy prison as well. The guy must be blessed.
He's untouchable. It doesn't even matter which House ends up sitting on the Iron Throne believing they're in charge. They won't be. Not really. His religious authority places him above the law, his well-armed fanatics protect him from it and the faith of the commoners keeps him there. The High Sparrow isn't just #winning. He's already won.
Lydia Jenkin says it's Tyrion:
Who could you choose but Tyrion? The little battler has freed himself from the Lannisters (who really don't understand there's no 'I' in team); crossed the narrow sea; distanced himself from all the petty squabbles going on in Westeros; given Sir Jorah a new sense of purpose; survived an attack from the stone men; and finally convinced Daenerys that he's probably the most whip-smart, under-valued but over-experienced team coach she could ask for.
Plus, despite being disadvantaged in the height department, he threw himself into the fray during the Sons of the Harpy terrorist attack at the fighting pits and saved Missandei. He definitely gets a chocolate fish for that.
His alliance with Daenerys is surely going to be a keystone to the future of the seven kingdoms, and the survival of, well, anyone, once the White Walkers conquer the Wall. With his wisdom and cunning, and her dragon-taming abilities, I'm sure they'll come up with an excellent game plan.
Chris Schulz says it's Drogon:
Come on, people! The world of Westeros doesn't belong to mere mortals. The champions of Thrones' fifth season have either risen from the dead, or been hatched out of shells. Look at the way the White Walkers arrived in Hardhome.
With a mere raising of the boss man's arms, every slaughtered Wildling slumped on the ground awoke, opened their eyes and joined in the gothic uprising.
You think Jon Snow, his nerdy buddy Samwell Tarly and one Wildling giant can singlehandly stop Winter's enormous army from slaughtering everything in their path? No, the only way those at the Wall - and thus those in Westeros - have a chance against the marauding zombies is if Drogon is on the front lines.
This week's episode was proof that as long as you've got a scaly, super-angry, fire-breathing beast on your side, everything is going to be okay. Daenerys, get your buddy down to the Wall in double-quick time, or there won't be anything left for you to be Queen of.
The season final of Game of Thrones season five screens on SoHo on Monday. Go here for our weekly Thoughts on Thrones blog.