One interesting plot could be the OC being a healer who tends to Jaime's wounds after a battle. Their relationship starts as a patient - healer dynamic but gradually evolves into something more romantic as they get to know each other's true selves.
Another plot could be that the OC is a noblewoman who is betrothed to someone else, but she and Jaime have a fateful encounter. They then start a secret relationship, constantly having to hide their love from the prying eyes of the court and deal with the political implications of their actions.
One possible plot could be about how Jaime has to face his complex family dynamics when Sansa is pregnant. He might struggle with how his sister Cersei would react and also deal with the political implications in Westeros.
One great 'Jaime Lannister OC Wife Fanfiction' is 'The Lion's Bride'. It delves deep into the relationship between Jaime and his original character wife. The story shows how she changes his perspective on life and honor in the complex world of Westeros.
Love and friendship are also common themes. The oc might form a deep emotional bond with Jaime, whether it's romantic love or a strong friendship. This bond can help Jaime grow as a person. In some fanfictions, their relationship is what gives Jaime the strength to face his demons. Another theme could be power dynamics. Jaime comes from a powerful family, and the oc's relationship with him can either disrupt or reinforce those power structures.
He could marry a foreign princess. This would bring a new dynamic as she might have different cultural values and beliefs, which would create interesting storylines as Jaime adjusts to being with her.
A prevalent theme is also loyalty. He has to decide where his loyalties lie - with his family, with a particular lord or lady, or with a cause. For example, in some fanfictions, he has to choose between loyalty to his father Jaime and loyalty to a king who might be unjust. There's also the theme of identity. Being an OC in the world of Game of Thrones, he has to find his place and identity among the established characters and houses.
Another theme is love against all odds. Given Jaime's complex character and his place in the Lannister family, falling in love with an OC who might be from a different social class or background creates a lot of drama. It's about two characters defying the norms of their world to be together.
Some fanfictions have Jaime exploring the Free Cities. This is different from his usual Westerosi setting in the show. He gets involved in different cultures and politics there, which makes for an exciting read as we see how he adapts.
One popular plot could be Jaime traveling back in time to prevent certain events in the Game of Thrones universe. For example, he might go back to try and stop the Red Wedding. This would change the entire political and power dynamic in Westeros. Another could be him traveling forward in time to see the consequences of his actions and then having to go back to fix things. It could also involve him traveling to a different time period altogether, like the Age of Heroes, and interacting with the legendary figures of that era.
One great jaime lannister oc fanfiction is 'The Lion's Redemption'. It shows a unique original character interacting with Jaime in a way that really changes his perspective. Another is 'Jaime and the Mysterious Stranger' which has an interesting plot where the oc helps Jaime through some difficult moral dilemmas.
The popularity of 'Jaime Lannister OC Wife Fanfiction' lies in the fact that Jaime is such a complex character. Fans love to explore his character further by pairing him with an original character. It gives them the freedom to create unique storylines that the show or books might not have covered.