One idea could be that the reincarnated Lannister has all the memories of their past life. They could use this knowledge to avoid the mistakes their previous self made. For example, not getting involved in certain political schemes that led to their downfall. Another plot could be that they try to change the fate of their family members. Maybe prevent Jaime from losing his hand or stop Cersei from going down her tyrannical path.
An interesting plot could revolve around the reincarnated Lannister having a special ability due to their reincarnation. For instance, they could be able to communicate with the old gods or the new. Using this ability, they could gain insights into future events and manipulate them to the advantage of the Lannisters. They could also try to use this to heal the rifts within their own family. Maybe they could convince Tyrion that he doesn't need to be at odds with his siblings all the time and work together for the greater good of the family.
Well, a great plot for a Lannister reincarnated fanfic could be that the reincarnated character wakes up in a completely different time in the Game of Thrones universe. Say, during the time of Aegon's Conquest. With their knowledge of future events and Lannister tactics, they could try to form alliances that would benefit the Lannister family in the long run. They might also try to change how the Lannisters are perceived by the other houses, perhaps by being more benevolent and less power - hungry.
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.
Cersei could be the most interesting in a sense. If she were reincarnated, she could either double down on her power - hungry ways or completely change. Maybe she could learn from her past mistakes and become a more benevolent ruler. Or she could use her reincarnation as a way to exact revenge on those who opposed her in her previous life in more devious and calculated ways.
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 possible plot idea could be a Lannister character traveling to Taiwan - like setting in the Game of Thrones world and having to adapt to a different culture and political landscape there. Maybe they form alliances or face new enemies.
One idea could be reincarnating as a minor character, like a servant in King's Landing. You could use your modern knowledge to avoid the chaos of the city and slowly rise in power by befriending key players. Maybe you know of some herbal remedies that could save a noble from a deadly illness and gain their favor.
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 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, 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.