Game Of Thrones Season 7 Finale: Predicting Who Lives & Who Dies
4. Grey Worm
Where He'll Be
By the look of the trailer, he, the Unsullied and the Dothraki go to High Garden to lay siege to Bronn and Jaime (unless the same castle is being used for a Gate Castle in King's Landing as was used for the Tyrell stronghold).
After that, he might go to the Dragonpit.
Verdict: Lives
Ever since Grey Worm and Missandei shared their love for one another, the Unsullied's most desirable soldier has had a target on his back. As he said himself, she is his weakness, and unfortunately, if she's in his head and his heart, he's vulnerable.
But then again, the show needs him to lead the Unsullied, who will be one of the key cannon fodder elements for the war against the wights. As long as the show needs bodies to fall, he needs to be there to lead them.
3. Theon Greyjoy
Where He'll Be
At the Dragonpit, but also possibly looking for his sister Yara wherever Euron has got her imprisoned (or her remains if he's done the unthinkable). Expect a meeting of Greyjoys at the very least.
Verdict: Lives
This could go either way: if Theon gets his chance to fight Euron and gain vengeance not only over him but also the spectre of Ramsay and manages to save Yara, he'll probably die in the process, as it's the most fitting way to deal with him. And not to mention, he probably deserves to die for all that he did before he became Reek.
But if Yara dies and Theon lives to kill his uncle, then he's likely to be given an opportunity to fight alongside Jon in the last season, where he'll probably die.