I think it could be the blacksmith OC who has a strong moral code. For instance, an OC who refuses to make weapons for evil lords or sells his work only to those who he believes will use it for good. This type of character adds depth to the fanfiction and can be very appealing to readers who like complex and morally upright characters.
OC Myranda in fanfiction could be used to explore different relationships. For example, she could have an unexpected friendship with a character that was her enemy in the show. This could lead to some really cool plot twists. Also, the author could change her role in the political intrigue of Westeros. Instead of being just a tool for Ramsay Bolton, she could become a key player in her own right, manipulating the power dynamics in a different way.
The OC Greenseer could act as a guide. They might use their visions to lead characters to hidden treasures or safe havens. For instance, they could show a group of refugees the way to a secret valley where they can survive the winter and the war.
An OC Stark might be more politically astute than the original characters. They could form different alliances, like making a deal with the Iron Bank that gives the North more financial power and influence. This would shift the power dynamics not only in the North but also across Westeros. The original plot of various houses vying for the Iron Throne would be affected as the North becomes a stronger and more independent force.
One great 'Game of Thrones OC Mage' fanfiction is 'The Mage of Westeros'. It has a well - developed original character who is a mage. The story weaves in the complex politics of Westeros while the mage uses their powers to navigate through various challenges.
Petyr Baelish often plays a devious role in OC fanfiction. He might be the mastermind behind many plots. For example, he could be using an OC to gain more power in King's Landing.
In OC (Original Character) fanfiction related to Petyr Baelish from Game of Thrones, he is often portrayed as a complex and shrewd character. His manipulative nature can be explored further. For example, an OC might be a new pawn in his grand schemes, or perhaps a character who tries to outwit him. Fanfiction gives authors the freedom to delve deeper into his motives and actions, which might not be fully explored in the original series.
Margaery can also be a symbol of hope or change in fanfictions with a male OC. If the male OC is disillusioned with the current state of Westeros, Margaery could represent a new way forward. Her charm and intelligence can inspire the male OC to support her in her plans to reform the kingdom. Their relationship then becomes a driving force for the plot, as they strive to make Westeros a better place while also dealing with their own personal feelings for each other.
One great 'Game of Thrones' OC harem fanfiction is 'A New Player in Westeros'. It has an interesting original character who forms a unique harem with characters from different houses. The plot is full of political intrigue and romantic elements.
A really interesting plotline would be if the godlike OC discovers a hidden threat to Westeros that the other characters are unaware of. This could be an ancient evil lurking beneath the surface. Due to their powers, they are the only one who can sense it. So, they have to convince the various lords and ladies of Westeros to believe them and help in the fight against this new danger. It could also be a plotline where the OC tries to change the way Westeros is ruled, perhaps introducing a more egalitarian system, which would be a huge shift from the feudal society shown in the original series. This would lead to many conflicts as the traditional rulers resist the change.