Well, a cool plot for a 'warden game of thrones fanfic' might be that the warden stumbles upon a secret passageway that leads to a hidden treasure. But this treasure is not just gold, it's a powerful weapon that was used in the ancient wars of Westeros. As he tries to keep it a secret, word gets out and he has to fend off various factions who want it for themselves. Or perhaps the warden is visited by a mysterious figure from another land who claims to have knowledge of a future disaster that will befall Westeros if certain actions are not taken.
For a 'warden game of thrones fanfic', the warden could be a character who is trying to reform the laws of his land. He faces opposition from the traditionalists who want to keep things as they are. Meanwhile, he also has to deal with external threats from neighboring regions. He might also have a personal quest to find out the truth about his family's past, which is somehow connected to a dark secret in Westeros' history. This could lead to all kinds of adventures and political intrigue as he tries to balance his personal goals with his duties as a warden.
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 that Elsa is a powerful sorceress from a far - off land who arrives in Westeros during the War of the Five Kings. She could use her ice powers to control the weather and influence battles. For example, she might freeze the moats of castles to make them easier to invade or create ice bridges over rivers.
Well, a cool plot for a 'Game of Thrones Machinist' fanfic could involve a machinist who is an outcast but has incredible skills. He could be hired by Daenerys to build some sort of war machines for her army. Maybe he creates a huge catapult that can launch fireballs over long distances. Or he could be forced to work for the Night King, building devices to break through the Wall. In this way, the machinist's skills become a crucial part of the power struggle in Westeros.
One idea could be a character reincarnated as a different species, like a dragon. They could then use their new form to influence the power struggles in Westeros. Another could be a reincarnated character remembering key events from the original series and trying to prevent certain tragedies from occurring. For example, if Ned Stark was reincarnated, he might be more cautious and avoid getting caught in the political traps that led to his downfall.
One idea could be to explore the origin of Ulthos. Maybe it was a hidden land filled with ancient magic that was long forgotten. A character from Westeros could accidentally discover a map leading to Ulthos and embark on a journey full of strange creatures and unknown cultures.
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.
One idea could be a fanfic that focuses on the backstory of a minor character, like Gendry. Explore his life before he met Arya, how he survived on his own in King's Landing, and his early days as an apprentice to the blacksmith. Another could be a story set in a different part of Westeros during the events of the main series, perhaps in Dorne, and show how the political unrest there affected the common people. A third idea would be to create a fanfic where the White Walkers are not the main villains, but instead there is a new, more insidious threat emerging from within the Seven Kingdoms itself.
One idea could be to write a fanfic about a character who was thought to be dead but actually survived and is secretly plotting revenge. For example, a Stark family member who everyone believed perished in the Red Wedding.
One idea could be to explore the backstories of minor characters in Yi Ti. For example, a young servant in a noble house who has dreams of rising above his station. He could get involved in political intrigues that mirror the larger power struggles in Westeros.