One idea could be an engineer SI who uses their knowledge to improve the defenses of a particular house in Westeros. For example, they could design more efficient siege weapons or fortifications that are resistant to dragon fire. This would add a new dimension to the power struggles in the Seven Kingdoms.
Perhaps the engineer SI could be kidnapped by a warlord who wants to use their skills to build a grand, impregnable fortress. The SI then has to navigate the politics and power plays within the warlord's camp while trying to ensure their creations are not misused for excessive destruction.
How about being a foreign diplomat from Essos? You come to Westeros with the intention of forging trade deals but end up getting involved in the power play for the throne. You could introduce new customs and ideas from Essos, and also have to deal with the xenophobia that exists in Westeros while trying to achieve your own goals.
One idea could be a young child from our world being inserted into the story during the events at King's Landing. They could befriend Arya Stark and help her in her quests, perhaps by using their knowledge of modern things in a creative way, like making simple traps with modern concepts. Another plot could involve the kid getting caught up in the politics of the North, trying to convince the lords to unite against the White Walkers earlier. Or they might be found by Daenerys and become a sort of mascot for her army, bringing a new perspective to her claim for the Iron Throne.
One plot idea could be that your self - inserted character is a Lannister bastard who is trying to prove their worth to the family. Another is that your character discovers a long - lost Lannister treasure and has to fight off other family members who want it for themselves. Or perhaps your character is a Lannister who has a secret alliance with a rival house and is trying to bring down the main Lannister power from within.
One idea could be that your self - inserted character is a healer with a mysterious past. They end up in the middle of the war between the Starks and the Lannisters and start to form relationships with key characters from both sides, creating a harem of sorts. Another plot could be that your character is a time - traveler who tries to change the events of 'Game of Thrones' and in the process, attracts the attention of different characters who fall for them.
One interesting 'Game of Thrones' SI fanfiction could be the ones where the self - inserted character tries to change the fate of their favorite characters. For example, preventing Ned Stark's death. Another might be about a modern - day person using their knowledge to introduce new technologies in the 'Game of Thrones' world, like advanced medicine. And there are also those where the SI character gets involved in the power struggles, like trying to claim a throne for themselves in a unique way.
One idea could be to insert yourself as a commoner in King's Landing. You could be a street - smart character who witnesses all the political intrigue up close. Maybe you work in a tavern and overhear the schemes of the nobles. Another idea is to be a foreigner from Essos who comes to Westeros with unique skills, like being an expert in a form of magic unknown in Westeros. You could then get involved in the power struggles while trying to keep your own identity and goals secret.
The plot might involve the self - inserted character being found by a group of wildlings after the plane crash. Since they come from the modern world, they might be seen as some sort of strange being. But they could start to learn the ways of the wildlings and use their unique skills, like being able to read maps better or having a better understanding of the stars for navigation, to help the wildlings. And in return, the wildlings could protect them from other threats in the Game of Thrones world.
In 'A Game of Thrones self - insert fanfiction', themes like adapting to a new culture are common. Since Westeros has its own unique set of rules, religions, and social norms, the self - insert character has to learn and adapt. Betrayal is another theme. Given the cut - throat nature of the politics in the series, it's likely that your character will experience or be involved in some form of betrayal. And the theme of prophecy can also be used. Maybe your character is somehow related to an old prophecy in Westeros and has to fulfill it or prevent it from coming true.
Another one to check out is 'My Life in Westeros as an SI'. This fanfic really delves deep into the daily life of the self - inserted character. It shows how they adapt to the different cultures, languages, and customs in Westeros. The story is full of little details that make it feel like a real extension of the 'Game of Thrones' world, and the character development is quite engaging.
In self - insert Game of Thrones fanfiction, the theme of cultural clash is quite common. The self - inserted character comes from a modern world (usually) and has to deal with the medieval - like culture of Westeros. There's also the theme of changing fate. Many self - inserted characters attempt to change the fates of the characters they love from the original story, like trying to save Ned Stark or prevent the Red Wedding. And finally, the theme of adaptation. They have to adapt to the different languages, customs, and ways of life in Westeros.