Sansa Stark is a very common character to be featured. Since she had such a complex and evolving storyline in the original series, fanfiction writers love to explore different paths for her. They might write about a more powerful Sansa who takes control of the North much earlier than in the show.
Arya Stark is another popular choice. Given her skills as an assassin in the original series, fanfictions often take it further. For instance, she could be training other young girls to be as skilled as her, or she could use her skills to protect a whole new set of characters, perhaps a group of orphans she takes under her wing in a fan - created scenario.
Daenerys Targaryen is often a common character. Given her allure and power, she can be a central figure in a harem setting. Her dragons also add an interesting element to the story.
Daenerys Targaryen is often a main character. Since Dragonstone was an important place for the Targaryens, many fanfictions revolve around her connection to it. She might be exploring the secrets of the place or using it as a base for her conquests.
Often, a common theme is revenge. If her family was wronged in the original Game of Thrones story, the daughter in fanfiction might seek revenge. She could use her wits and skills, which might be newly developed in the fanfiction, to take on those who caused harm to her family. It gives the character a strong motive and makes for an exciting plot as she plots and executes her revenge plans against powerful foes.
One common theme is survival. Given all the hardships the Stark daughters face in the original series, fanfictions often explore how they continue to survive in different and sometimes even more challenging situations. For example, they might face new enemies or have to deal with political intrigue on their own.
Daenerys Targaryen is often made into an overpowered character in fanfiction. Her already - strong position in the series can be amplified, like giving her the ability to control all dragons at once without any limitations, instead of the gradual growth in power she had in the original story.
Bran Stark is definitely one of the most popular warg characters in 'Game of Thrones' fanfictions. His journey in the original series as he discovers and hones his warg abilities gives fanfiction writers a lot to work with. He can be placed in all sorts of different scenarios, such as using his warg powers to prevent the fall of Winterfell much earlier or having more direct confrontations with the Night King through his warging.
The Children of the Forest are also common in shapeshifter fanfictions. They are already somewhat mysterious in the original series, and their connection to magic makes them ideal candidates for shapeshifting in fan works. Writers might have them shapeshift into different animals or even blend in with humans to protect their secrets or fight against their enemies.
Jon Snow is often a popular choice. His skills in combat and his complex backstory make him an interesting character to include in a tournament setting. He could be fighting for honor or to prove himself.
Kakashi is another character that might show up frequently. He could be Naruto's mentor in understanding the sword's powers or the mysteries behind it. Jiraiya might also be present in some fanfictions. He could have some connection to the sword from his past adventures and pass on some important information to Naruto. Additionally, villains like Orochimaru might be interested in the sword and try to steal it from Naruto, which makes them common characters in these fanfictions.
In some fanfictions, Gendry is paired with Melisandre. Given her mysterious nature and her past interest in Gendry in the show, it makes for an interesting pairing. Their relationship could be explored in terms of power, magic, and the manipulation that might occur between them as they navigate the complex world of Westeros.