Some Game of Thrones fans see a clear path to heroism for Tyrion: Climb aboard the dragon train. Literally. As outlined by Thrillist writer (and GoT expert) Lindsey Romain, the popular "Dragon has three heads" theory has long predicted that Tyrion, who was often referred to as "no son of mine" by his withering father Tywin, is secretly a Targaryen. "His mother, Joanna, was an object of lust for the Mad King, and the timeline works out just right that she may have been in his presence around the time of Tyrion’s conception," writes Romain. She also points out why that theory might be a little lame. "Though the idea of another secret Targaryen is exciting, it would undo Tyrion’s complicated relationship with Tywin, which is a lynchpin of his characterization."
I tend to agree. The image of Tyrion soaring across the sky with Dany and Jon just feels silly, like the pandering embodiment of fan service. The idea of there being multiple secret Targaryens is too cute. Plus, the Night King assuming control of one of Dany's dragons clearly throws a wrench into this prophecy. We haven't seen the blue-eyed dragon in action yet, but it would shock me if he took kindly to human passengers. Even secret Targaryens.
That means Tyrion will have to find a cleaner route to hero status, one that will presumably find him crossing paths with his brother and his sister again. It's likely that the final conflict of this season will also tie back to what could be considered the original sin of the Game of Thrones universe: the attempted murder (and crippling) of Bran at the hands of Cersei and Jaime. Remember, Tyrion was put on trial for this crime back in Season 1 and won his innocence thanks to Bronn's skills in a trial by combat. Jaime and Cersei have certainly suffered in recent years, but they're still breathing. It remains an act that demands retribution.
With Bran and Arya in Winterfell, that leaves Jon Snow and Tyrion to administer justice. Given how few major characters have died in this shortened season, the possibilities for bloodshed in the finale are numerous: Cersei and Jaime could both be on the chopping block, along with a range of supporting figures. Or Tyrion himself could meet his end. If he does, it would be a near fatal blow for this show: there's no clear line of succession if Game of Thrones kills off its most emblematic character.