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.
It could be a powerful sorcerer who wants to take the magic hand for himself. This sorcerer might see Jaime as an unworthy holder of such a powerful artifact and will stop at nothing to get it.
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.
Sure, many fanfiction authors like to play around with different character combinations and scenarios. Jaime Lannister is a complex character, and Lyanna has her own allure in the story. The idea of her being pregnant in a fanfiction involving Jaime could be used to explore themes like love, honor, and the consequences of actions. It might show how these two characters from different houses and storylines interact in such a situation.
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.
Their story in the original series has many open - ended aspects. Fans want to see more of their relationship develop, whether it's in a romantic way or just a deep friendship. Fanfiction allows for the exploration of different paths their relationship could take, such as how they might rule together if they were in charge of a certain area, or how they would react to threats against each other.
Brienne of Tarth is often paired with Jaime in time travel fanfictions. Their relationship in the original series was complex and interesting, so in time travel scenarios, they might travel together or meet in different time periods. Brienne could be the one to help Jaime understand the importance of honor in different historical contexts. Another common pairing is with Tyrion Lannister. As Jaime's brother, they could time travel together and use their combined wits to navigate different situations. Tyrion might be able to use his intelligence to figure out how to manipulate time - travel related events to their advantage.
There's also an OC that was a priestess. She had a very different world view from Jaime, and their interactions were really interesting as they debated about morality and faith. The author did a great job in making her character complex and multi - faceted.
A friend or a family member of Jaime could be significant. They could be there to offer emotional support, or they might have their own opinions about the new hand. Their relationship with Jaime could be tested and strengthened throughout the story.