A spin - off about the Iron Islands could be really cool. Show the life of the Ironborn, their unique culture of raiding and reaving. Maybe it could follow a young Ironborn who tries to change the traditional ways of his people, facing opposition from the more conservative elements of the islands. There could be lots of sea battles and political intrigue among the different Ironborn houses.
One idea could be a spin - off focusing on the early days of the Targaryen dynasty. We could see how they first came to power in Westeros, their dragon - riding adventures, and the power struggles within their own family. It would be fascinating to explore the origins of their rule and how it set the stage for the events in Game of Thrones.
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.
One interesting plot idea could be exploring what would happen if a minor character, like Gendry, had secretly been trained in magic all along. He could use his newfound powers to try and claim the Iron Throne in a different way than the main characters. Another idea is a fanfic set in the past, showing how the relationship between the Starks and the Lannisters first started to sour. Maybe a long - forgotten event that set the stage for all their future conflicts.
One idea could be exploring what would happen if a minor character, like Gendry, had a more central role in the fight against the White Walkers. He could lead a group of common folk and prove that the power doesn't always lie with the nobles.
A really cool 'Game of Thrones fanfiction' plot could involve the resurrection of some of the dead characters in a different way. For example, what if Ned Stark was brought back not as a vengeful wraith but as a wise advisor to a new king or queen? His honor and wisdom could shape the future of Westeros in a completely new direction. And it would be interesting to see how the other characters react to his return.
Perhaps a fanfiction where Daenerys Targaryen lands in Westeros earlier and forms an alliance with the Starks before the events of the main series. This would completely shift the political landscape and the fight for the Iron Throne. She could bring her dragons to help fight the White Walkers from the start.
One idea could be exploring what would happen if a minor character, like Gendry, became the King of Westeros. He has a claim to the throne through his Baratheon blood and his time with the Brotherhood without Banners could give him a different perspective on ruling. Another plot could involve a female character, like Brienne, leading a new order of knights that are dedicated to protecting the realm in a more democratic way. Or perhaps a story where the White Walkers and the humans form an uneasy alliance against a new, even greater threat from Essos.
One idea could be the Hound's journey after leaving King's Landing. He could encounter a group of outcasts and form an unlikely alliance to protect a small village from raiders. It would show his growth from a bitter, angry man to a more empathetic protector.
In Spartan Game of Thrones fanfiction, a possible plot is the discovery of Spartan artifacts in Westeros. A young maester finds a hidden vault with Spartan weapons and armor. He tries to understand their purpose and power. Meanwhile, a knight from a minor house gets hold of one of the Spartan swords. With it, he gains an edge in combat and becomes a key player in the power struggles, attracting the attention of the major houses and changing the course of the political and military affairs in Westeros.
One idea could be a crossover where characters from Rome end up in the world of Game of Thrones. For example, Julius Caesar arriving in Westeros and trying to conquer it with his military tactics. Another could be a story about a gladiator from Rome who finds himself in the middle of the power struggles in King's Landing.
Well, you could write a fanfic where Arya Stark decides to use her skills not for revenge but for building a new society in the ruins of Westeros. She could start a school for orphans and teach them self - defense and survival skills. Also, a plot where Bran Stark uses his powers to travel back in time and prevent some of the worst events from happening, like the Red Wedding. And a fanfic about how Jaime Lannister redeems himself in a more public way by protecting the smallfolk during a great war.