A House of the Dragon, the Jon Snow sequel is still in the early stages of development, although the involvement of Kit Harington and the importance of the character suggests that it could become a reality sooner rather than later.
Prior to the announcement of the Jon Snow series, all the other Game of Thrones spinoff shows in development were prequels to the main story of A Song of Ice and Fire. Despite the criticism, Game of Thrones season 8 played like a true ending and tried to wrap up all of the important storylines, which made it difficult to predict that a sequel series would happen. More especially, Jon Snow's story seemed to be completed, as the character had chosen to renounce his Targaryen birthright and any connections to the politics of Westeros.
However, the Game of Thrones sequel project reveals that there still is a Jon Snow story to be told. Given how the Game of Thrones finale did not leave many loose ends, it is important to look back at the characters and storylines connected from the A Song of Ice and Fire books that were connected to Jon Snow (or Aegon Targaryen) but never made into Game of Thrones to try to predict who villain of the spinoff will be. It is also interesting to revisit some of the most popular Game of Thrones finale fan theories, as the Jon Snow spinoff could turn some of those into reality. Here is a breakdown of the best five possible villains for the Game of Thrones Jon Snow sequel.
The Great Other
The short-lived Long Night and the relative easiness with which the Night King and the White Walkers were defeated is one of the most criticized points of Game of Thrones season 8, especially because the show had been teasing the Great War since its pilot. In the end, it was the "game of thrones" played by Cersei and Daenerys that was the final battle of Game of Thrones and not the conflict with the undead. However, the Jon Snow spinoff has the chance to flip it by revealing that the Night King and its creations were just a part of a much bigger evil.
In the ASOIAF novels, the followers of R'hllor, such as Melisandre and the other Red Priests, believed that the Lord of Light had an equally powerful opponent who represented its exact opposite. Whereas the Lord of Light represented fire and life, the so-called "Great Other" represented cold and death. The books never made it seem like there was a physical embodiment of the Great Other, but Melisandre believed that the Others, referred to in Game of Thrones as the White Walkers, are creations of this Great Other. The Jon Snow spinoff series could bring that concept by having Jon facing a new creation attributed to the Great Other.
The Three-Eyed Raven
Bran made sure to let everyone know, including the Stark family, that he was no longer Bran but rather the Three-Eyed Raven. However, in the most controversial decision of the finale, Bran became King at the end of Game of Thrones, leaving the question of why the Three-Eyed Raven would be interested in taking care of the politics of Westeros. Even if there was no hidden meaning in the Bran becoming king storyline, the Jon Snow spinoff could use it as an opportunity to establish that the Three-Eyed Raven is actually a menace to the world when given the power to rule all of Westeros. The Three-Eyed Raven's goals were never made much clear, especially in the book, which makes it a great concept to be further explored in a Game of Thrones sequel show. Not only would it make for an interesting clash between brothers, but it could also make the Game of Thrones finale better in hindsight.
Val (Leading A New Wildling Clan)
There are several A Song of Ice and Fire characters who were not in Game of Thrones, and one of which is connected with Jon Snow's story. Val, also known as "the wildling princess," was one of the many people whom Jon Snow bounded when beyond the wall with the free folk. Val was the sister to Mance Rayder's wife, and as such, she was always close to the most important decisions made by the King Beyond the Wall. Val is described as fearless and has an aptitude to lead, which can make her an interesting character to open Jon Snow. Obviously, having Val appear after the end of Game of Thrones would make her story a lot different, as she had been around since the second A Song of Ice and Fire novel, but it could still work. Jon and Tormund are now the "leaders" of the free folk, but the world beyond the wall is big enough for a new wildling clan led by Val to appear.
The Children Of The Forest
The Children of the Forest are a crucial part of Game of Thrones' Westeros mythos, but as with the Night King and the White Walkers, the resolution of their stories on the show brought more questions than answers. The Children of the Forest created the first White Walker, the Night King, as a response to the men who were destroying their world. There were said to be extinct, but Bran eventually ran into a group of remaining Children of the Forest. That group also did not survive, but it is possible that are remaining Children of the Forest in Westeros. Similar to what happened 12,000 years ago, this remaining group could try to create a new, better-controlled White Walker to destroy humanity, calling for Jon Snow's intervention.
Daenerys Targaryen (Resurrected By A Red Priest)
Theories about Daenerys Targaryen being resurrected became common after the Game of Thrones ending. While most of that stemmed from the fact that many did not like Daenerys' ending, it is not at all far-fetched to imagine that Daenerys could be resurrected in a Game of Thrones sequel. It was confirmed by the Game of Thrones showrunners that Drogon took Daenerys to Volantis. That was where Kinvara and other Red Priests like Melisandre lived, meaning that one of them could try to resurrect Daenerys. The Mother of Dragons would obviously have a lot of reasons to get revenge on Westeros and Jon Snow, and given that the resurrection process can make a person different from who they were before, Daneyes could be an even more dangerous character in the Game of Thrones Jon Snow sequel. However, Emilia Clarke has stated that she is not involved in the project, making this option less likely.