There might be descendants of the main characters from 'Game of Thrones'. For example, the children or grandchildren of Jon Snow, Daenerys Targaryen etc. could be central characters.
New characters introduced from unexplored regions of the 'Game of Thrones' world are also likely. Maybe some powerful lords or ladies from far - off lands that have been sheltered from the previous wars but now step into the fray. Also, characters related to the minor houses in 'Game of Thrones' might get more spotlight in the successor stories. They could be seeking to rise in power and status after being overshadowed in the original series.
One thing we can anticipate is more complex relationships. The successor stories might explore different types of love, loyalty, and betrayal. There could be new alliances formed between unexpected characters. Also, the world - building will probably continue, perhaps expanding on areas of the 'Game of Thrones' world that were not fully explored before. Maybe we'll learn more about the cultures and histories of the different regions.
Tyrion Lannister is definitely one of the most memorable. His sharp wit and intelligence, despite being a dwarf in a world that often looks down on him, make him stand out. He has some of the best lines in the story and his actions have a great impact on the plot.
Another possibility is Cersei and Jaime. Their relationship is already very complex and twisted. In a fanfiction, it could be a different take on their relationship where Jaime is seen more as a king - like protector to Cersei, and she finds herself in his arms in a more tender and loving way than their usual dynamic in the show.
Daenerys, Jon Snow, and Cersei are very likely to be main characters as they have been central to the story so far.
Daenerys could be in it. She has a strong personality and is used to being in control. If someone challenges her or her claim to the Iron Throne in the fanfiction, it could lead to a catfight. Also, Margaery. She's clever and manipulative, and a catfight with her could be very interesting as she tries to outwit her opponents using her charm and wits.
Theon Greyjoy is also a candidate. His identity and self - worth are often tied to his appearance. A headshave in fanfiction could be a way to explore his further degradation or, conversely, his redemption as he sheds his old self - image and tries to start anew.
Definitely Daenerys Targaryen. She was a major force in the previous story, and her quest for the Iron Throne is far from over. She has her dragons and a large army, so she'll be in the thick of things.
The king, of course, would be one of the main characters. It could be any of the kings from the 'Game of Thrones' universe, like Joffrey, who was cruel and unpredictable, or perhaps a more noble king like Stannis. The other main character would likely be the person in the king's arms. This could be a new character created for the fanfiction, or it could be an existing character from the show or books, like Sansa who was often at the mercy of different lords and kings.
Daenerys could be a likely character. She has a strong will, and seeing her being hypnotized or using hypnosis on others would be an interesting twist. It could play into her power dynamics, like hypnotizing her dragons to perform different tasks.
Arya Stark would also be a good choice. Her assassin skills could be put to use in a modern - day context. Maybe she'd be hunting down criminals instead of her enemies in Westeros. And her independent spirit would make her an interesting character to follow as she adapts to the real world.