Another possibility is that it could be a well - known character from 'Game of Thrones' who somehow acquires this new power of the 'fist that twists'. For instance, Arya Stark could be an interesting choice. If she had this power, she could use it to further her vengeance or change the fate of her family and friends in unexpected ways.
It could be about a character who has a powerful or unique fist. Maybe this fist has some special ability that twists the events or destinies in the 'Game of Thrones' world. For example, it could be a magical fist that changes the outcome of battles or political intrigue.
A great plot twist would be if Arya's gag was part of a larger scheme by the Faceless Men. They could be testing her in a new and extreme way. Maybe they want to see if she can still carry out her assassinations without being able to speak or use her normal methods. This would put her skills and training to the ultimate test.
The Mother. In the existing lore, she is a major figure. In fanfiction, she could be more actively involved in the events of Westeros. She could be a guiding force, using her powers to heal the sick and wounded, and trying to prevent the bloodshed that is so common in the Game of Thrones world.
Well, it could be a character created by the fanfiction writer, perhaps a powerful mage who emerges from a long - forgotten land and claims god - like powers. This new god might bring a new set of rules and magic to the already complex world of Westeros.
Perhaps it could be a character like Bran Stark. He has the power of the Three - Eyed Raven, which gives him access to a vast amount of knowledge and some control over time and events. It's not a far stretch to think that he could develop into a Master of Death in a fanfiction.
A possible plot twist could be that a maester discovers a way to use steam power to bring the dead back to life in a more controlled way. This would completely upend the power dynamics in Westeros. The Night King would no longer be the sole controller of the undead, and different factions might try to use this new - found 'life - giving' power for their own gains, whether it's to replenish their armies or to use the undead as a workforce in the new industrial settings.
One possibility could be a character named Ser Aric. He was trained by an old, reclusive master swordsman in the mountains. He combines speed and precision in his swordplay, and his unorthodox style often catches his opponents off - guard.
One main character could be a genetically - enhanced human who has special abilities, like Arya Stark's skills in the original. She could be on a mission to avenge her family who were killed by a powerful space - faring clan. There could also be a powerful warlord from a distant star system, a bit like Ramsay Bolton, feared for his cruelty and thirst for power. The interactions between these diverse characters would drive the story forward in this space - based Game of Thrones fanfiction.
Arya Stark could be a main character. She could use her skills as a Faceless Man to infiltrate the enemy's camp before a big battle and gather intelligence. Her ability to change her appearance would give her an edge in spying and sabotage operations during the battle.
It could be Arya Stark as the bodyguard. Given her skills in combat and disguise, she would make a great protector. She could be protecting someone like Bran Stark as he continues to develop his powers and is a target because of his abilities.