Well, for a 'Game of Thrones reincarnation fanfiction', you might consider having Arya Stark reincarnated as a sellsword. She could still retain her skills from her past life, like her ability to change faces and her combat skills. This new Arya could then get involved in various wars and power struggles across Westeros. Also, Jon Snow could be reincarnated in a world where the White Walkers have already won. He has to figure out a way to reverse the situation, using his past knowledge and leadership skills. And Cersei Lannister could be reincarnated as a maester's apprentice, which would give her a whole new perspective on power and politics.
In a 'Game of Thrones reincarnation fanfiction', a cool concept would be Bran Stark being reincarnated as a wildling. He would have to adapt to their way of life while still having his greenseer abilities from his previous life. This could lead to some interesting interactions between the wildlings and the people of the Seven Kingdoms. Additionally, Sansa Stark could be reincarnated during the reign of Aegon the Conqueror. She could use her charm and political acumen to either support or oppose Aegon's rule. And Jaime Lannister could be reincarnated as a knight in a more peaceful time in Westeros, having to find a new purpose without the same level of warfare and political chaos.
Well, in this kind of fanfiction, the reincarnation aspect might bring about the concept of characters getting a second chance at redemption. Take Jaime Lannister, for instance. If he were reincarnated, he could strive to correct his past wrongs. Also, it's interesting to think about how the reincarnation of magical beings like the Children of the Forest could impact the balance of power in the Seven Kingdoms. They could bring back long - lost magic and knowledge that had been forgotten over time.
One idea could be exploring what would happen if a minor character, like Gendry, had a more prominent role in the story. He could potentially become a powerful lord and change the political landscape.
A great idea for 'Game of Thrones fanfiction' is to rewrite the story from the perspective of the smallfolk. For instance, how did they really feel during all the wars and power struggles? How did the common people in King's Landing cope with the different rulers? You could also explore a fanfiction where the White Walkers are not the villains. What if there was a misunderstanding and they were actually trying to protect the realm from some other greater threat?
One idea could be exploring what would happen if Jon Snow was raised by the Starks as a trueborn son. Another could be a fanfiction about Daenerys Targaryen's journey if she had made different alliances earlier. Or perhaps a story about Arya Stark training with a different master assassin.
One idea could be exploring what would happen if a minor character like Gendry had been secretly trained in magic. He could use his newfound powers to unite the smallfolk against the warring nobles. Another plot could revolve around a female knight from the North who disguises herself as a man to fight in the wars, and along the way, she discovers secrets about the White Walkers that no one else knows. Or perhaps a fanfiction where Daenerys and Sansa form an alliance much earlier and together they reshape the power dynamics of Westeros.
A possible idea is to have a character like Daenerys Targaryen receive visions similar to those in the Bible. These visions could guide her in her quest for the Iron Throne, but also make her question her actions and power-hungry nature. It would be an interesting take on her character development.
An interesting 'oc game of thrones fanfiction' could focus on an OC who is a female knight in a world dominated by male warriors. She could face discrimination but also prove herself in tournaments and battles. Maybe she becomes a trusted ally of a major character like Jon Snow. Or you could have an OC who is a bard that spreads tales which either inspire or deceive the people of Westeros. Also, an OC who is a foreign diplomat trying to broker peace deals between the warring factions while having their own hidden agenda would be a great concept.
One idea could be Loki somehow being transported to the world of Game of Thrones and using his magic to manipulate the political intrigue. He might side with a particular house and use his wits to outsmart their enemies.
One idea could be to combine the magic systems. For example, in Warhammer there are powerful spells and in Game of Thrones there is magic like that of the Red Priests. You could have a character who is a hybrid of a Warhammer wizard and a Game of Thrones maegi, creating new and unique magical abilities and storylines. Another idea is to merge the political intrigue. The complex power struggles in Game of Thrones and the different factions in Warhammer could lead to some really intense and convoluted political plots. For instance, the different Chaos factions could be like the different Houses in Westeros, all vying for control and power.
Well, for 'Game of Thrones crossovers fanfiction', a cool one would be to cross it with 'The Chronicles of Narnia'. Imagine Arya Stark finding her way into Narnia and becoming part of the fight against the White Witch. Also, a crossover with 'Sherlock Holmes'. The detective skills of Sherlock could be applied to solving the mysteries and political intrigues in Westeros. And a crossover with 'The Hunger Games', where the citizens of the Seven Kingdoms are forced to participate in a similar brutal game.