Here's a huge question: if Tommen dies in Game of Thrones season 6 finale, who becomes king of the Seven Kingdoms? Many theories have been made in the last months, but now something has changed and a well-known character suddenly became the most likely person to sit on the Iron Throne if Tommen dies. Be careful: the last paragraph of this article contains spoilers.

The line of succession.

If Tommen dies a hypothetical succession crisis might emerge between Mycella and Stannis Baratheon, but they're both dead, as well as another possible pretender, Renly Baratheon.

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Stannis' daughter Shireen is also dead. Gendry and the other bastard sons of Robert Baratheon should be legitimized to have a claim to rule the Seven Kingdoms, and that is very unlikely (if not impossible).

The Targaryens.

Since Robert Baratheon's grandmother was a Targaryen, his closest relative on that side of the family is Daenerys (considering that Viserys is dead), but Robert's Rebellion against Aerys II Targaryen erased the succession rights for the Targaryens descendants (at least from the actual rulers point of view), and, besides speculations, the Great Council which will discuss the crowning of a new king after Tommen's possible death is never going to look at the Targaryens as possible pretenders to the throne.

Who is going to be king, then?

According to an amazing analysis of the Baratheon family tree made by a Reddit user, the only relatives of Robert Baratheon still alive are actually some Lannisters. Following this line of succession we find Mathin Lannister, then Jason Lannister, then Demon Lannister, then Gerold Lannister, then Tytos Lannister and then - guess who? - Tywin Lannister. Since Tywin is dead, the rightful heir to the Iron Throne would be Jaime Lannister.

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Since Jaime was recently removed from the Kingsguard, he's now in the position to claim the Iron Throne.

What about Jon Snow?

Be careful: spoilers will follow. Sorry, Jon Snow fans: Jon is far from being a possible pretender to the throne. As we already said, we should consider the Targaryen's line of succession eliminated (this can be reverted only by force, which is what Daenerys is planning to do), and we have to point out that, even if Jon is Rhaegar Targaryen and Lyanna Stark's son, he's still a "bastard", not to mention that a Great Council composed of Tyrells, Lannisters, and Tyrell and Lannister's men will never accept, under any circumstance, such a possible pretender.