Bran.

It's very meta. (and half the electoral college were his close relatives and most of the rest, their close friends, lovers & henchpersons).

Grey Worm was briefly named Master of War by Dany, but she got shanked, so he and the Unsullied fuck off to Naath, presumably to die of the butterfly disease.

With his departure, it is noted that his position is vacant, so I guess that's Dany's grand contribution to the political changes in Westeros: she created the Small Council position of Master of War. Master of Laws also remains vacant as of the episode's end, probably for more meta reasons, because the story doesn't follow any laws, so why should the kingdom in which it is set? Tyrion is Hand of the King, Brienne is Lord Commander of the Kingsguard, Davos is Master of Ships, Sam Tarly is Grand Maester and Bronn is Master of Coin. Also, Lord of Highgarden & Lord Paramount of the Reach.

Bran's official regnal name seems to be "King Bran the Broken" because that's what he's called on the handful of occasions to formally recite his name and titles.

The official name of Bran's kingdom is The Six Kingdoms, because Sansa said the North is done with this Iron Throne bullshit (and Drogon melted it anyway, so no one could claim it now that his mom is dead), and she's Queen in the North. Arya is going to sail west to see what's out there, and presumably the islands that Elissa Farman discovered in the books and named after the first three Targaryens, are going to be called Eddard, Catelyn & Robb. She wasn't there when Rickon died, so I'm gonna roll with that assumption.

Jon was the one who kills Daenerys while they're making out because he sees some practical moral flaws in her dreams to make the world a better place, and to appease the Unsullied, Bran sentences him to the Wall. He arrives, and barely pauses for them to open the gates, and rides out to meet Tormund, pet Ghost and head north with the Free Folk, presumably to set himself up as the new King Beyond the Wall, since there's no Others White Walkers to make life miserable up there anymore.

The Dothraki just vanish after Dany makes a speech to them & to the Unsullied, in foreign talk so she sounds more sinister, when she always made speeches to them in English before.

Drogon stole Dany's body (and Jon's dagger with it) and Bran is going to go magically searching for him for some reason.

Since Bran can't make babies, and thus we won't have any evil princes like Joffrey to worry about, the Lords of Westeros are going to meet in the ruins of the Red Keep whenever the king dies to pick a new king. Because that never goes wrong, and elite oligarchies NEVER choose tyrants. The idea of a democratic process to choose the leader is floated and laughed out of the room with explicit comparisons of common people to livestock. By the same people who are going to be responsible for choosing a non-tyrannical leader of half of a continent. This was all decided in a conference that started out as Tyrion's trial for freeing Jaime and resigning as Hand over Dany's atrocities, and Jon's trial for killing Dany. When they realize there's no one to pass sentence, they start the discussion about who should be the new king.

Edmure shows up at the meeting too, and seems to be throwing his own hat into the kingship ring, but after an embarrassingly disjointed speech that could just as easily be the result of Tobias Menzies wondering what the hell he's doing back on the show and desperately trying to explain his character, Sansa tells him to shut up and sit down.

Tyrion tries to talk, Grey Worm finally snaps and tells him to STFU, because he's been listening to Tyrion's bullshit since season six, not to mention having to chase Jaime all over Westeros courtesy of Tyrion's strategies, Tyrion admits he's right not to want to hear what Tyrion says, because he, Tyrion, is the worst, and just keeps on talking and proposes King Bran. I don't think Grey Worm says another word on-screen, until he's on a ship departing Westeros.

And when Sansa declares that the North is going to stay independent, the Prince of Dorne and Asha Yara Greyjoy, whose predecessors fought multiple wars to get what Sansa got for the asking, sit still and don't say a word.

Oh, and apparently, the official history of Westeros states that Tywin Lannister randomly invaded the Riverlands for no reason, and then died trying to pass a crossbow bolt while his girlfriend strangled herself in the next room. This history was composed by Archmaester Ebrose, whom book readers might recall as the chief of medicine in the Citadel, and show watchers might also recall as something similar, since he performed autopsies and lectured Sam about the dangers of messing around with highly contagious diseases. It could be worse, they could have given the job of writing the history to Brienne, who outright lies when finishing Jaime's page in the White Book, saying that he captured Riverrun with no loss of life. The Blackfish and the men who died fighting him would beg to differ.

You notice the total lack of action in my summary? That's a thing.