In some fanfictions, Jaime could receive magic that is linked to his golden hand. Maybe it has some sort of enchantment that allows him to sense danger or even project a shield. This would add a whole new dimension to his character. He would have to adapt to this new aspect of himself while still dealing with the politics and relationships in the Seven Kingdoms.
A great one might be 'Jaime's Magical Redemption'. In this, Jaime gets magic that helps him atone for his past sins. He uses his magic to help the common people, which is a big change from his previous self - centered actions. It's a story that really delves into his character development with the added element of magic.
One interesting story could be about Jaime Lannister's marriage changing his relationship with his family. In some fanfictions, his marriage might make him more distant from Cersei as he focuses on his new partner.
One interesting fanfiction could be where Jaime and Sansa form an unlikely alliance in King's Landing. Maybe they work together to uncover a conspiracy against the throne that no one else suspects.
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.
One great fanfiction could be one where Jaime and Brienne go on a quest together after the main events of the series. It might explore their relationship deeper as they face various challenges. They could encounter enemies from both their pasts and have to rely on each other's skills.
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 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.
One possible plot could be that Jaime uses the magic hand to gain new combat abilities. He might be able to deflect arrows or even send out energy blasts from the hand.
One great 'jaime lannister fanfic' could be the ones that explore his relationship with Brienne. For example, some fanfics might focus on their adventures after the events in the main story, where they face new challenges together. It shows a different side of Jaime, a more redeemed and heroic side.
One common theme is redemption. Given Jaime's complex and often morally gray actions in the original series, many fanfictions explore his journey towards redeeming himself. Another theme is love, whether it's his unrequited love for certain characters or new relationships he forms. For example, some fanfictions might explore a romantic relationship between Jaime and a commoner, which is a far cry from his usual noble - centered relationships.