In the first place, as a few years before, Tyrion Lannister was performed by Peter Dinkejah. The hero managed to change several ranks and lords, go and return from a long journey, and went back to Westeros in the seventh season. Most fan theories recognize that Tyrion has every chance to stay alive and, perhaps, lead the kingdom.
On the second line, the former Bastard, and now the heir to the Iron throne John Snow. The character does not lose popularity from the fans from the very first season, and now the fans will read the role of Azor Ahai - the hero who will overcome the king of the night. Whether the Hero of China Harington will die in this war or will take a lawful place, the audience will only learn in the final season.
And closes the top three leaders of Arya Stark. One of the favorite Heroines of the series and books is still a long life bookmakers, Sean Bean and most fans of the Games of Thrones. Even actress Macy Williams once hinted at such an instagram account.
Whether the expectations of the audience are justified or they will again have to survive the death of loved characters, it will become clear in April 2019.