Well, you could write a fanfiction where the dragons from 'Game of Thrones' are discovered by the Vikings. The Vikings, being fearless, might try to either tame them or fight them. This would create a really exciting and action - packed story. Or perhaps a story about a Stark traveling to the Viking world and forming an alliance with a Viking clan to fight a common enemy, like the White Walkers.
One idea could be a crossover where a Viking warrior somehow ends up in Westeros. Maybe he gets shipwrecked on the shores near King's Landing and has to navigate the complex politics there, using his Viking fighting skills to his advantage. Another could be a story where a character from 'Game of Thrones' travels to the Viking lands and has to adapt to their way of life, facing challenges like raiding and their different religious beliefs.
A great fanfiction idea could be centered around the magic in 'Game of Thrones' being introduced to the Viking world. A 'Game of Thrones' character, like a Red Priestess, could arrive in the Viking lands and start converting some of the Vikings to her faith, while others resist. This could lead to internal strife within the Viking clans, and also interesting interactions between the two different cultures.
One idea could be a scenario where the Vikings' raiding parties encounter the Night's Watch from Game of Thrones. Maybe they initially see each other as threats, but then realize they could be useful allies against the White Walkers. Another could be a story about a character from Vikings, like Ragnar Lothbrok, being magically transported to Westeros and having to navigate the complex politics there, similar to how he did in his own land.
One interesting fanfic could be about a Viking warrior finding himself in the world of 'Game of Thrones' and having to navigate the complex politics there. He might use his brute strength and Viking battle tactics in the battles of Westeros.
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.
In 'Game of Thrones Crossover Fanfiction', a cool concept would be crossing it with 'Alice in Wonderland'. Alice could wander into Westeros and disrupt the power balance with her strange and magical ways. Another idea is to cross it with 'The Hunger Games'. Have the districts be like the different regions of Westeros and the Capitol be King's Landing. And a crossover with 'Supernatural' where the Winchester brothers hunt down the supernatural threats in Westeros.
A cool fanfiction concept could be a situation where the magic in Game of Thrones has an impact on Smallville. Suppose a powerful sorcerer from Westeros accidentally opens a portal to Smallville. This could lead to all kinds of chaos as the residents of Smallville have to deal with magic they've never seen before. On the flip side, the Kryptonians' powers could be seen as a threat in the eyes of the Game of Thrones characters, leading to a potential conflict. Or perhaps some of the noble houses in Westeros could try to form alliances with the powerful beings in Smallville for their own political gain.
One idea could be a story where a character from 'Game of Thrones' is transported into the world of 'For Honor' and has to adapt to its combat styles. For example, Jon Snow finding himself in the middle of a battle in 'For Honor' and using his skills to survive. He might form alliances with the different factions in the game, much like he did in 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.