In fanfiction, Lysa Arryn could be paired with Varys. Varys is known for his web of spies and political maneuvering. A story with them together could involve Varys trying to use Lysa for his own political ends in the Vale or Lysa trying to outwit Varys. Another great pairing could be with Brienne of Tarth. Brienne's sense of honor and Lysa's more self - serving nature could create an interesting dynamic. They could be in a situation where Brienne has to protect Lysa or Lysa has to decide whether to trust Brienne. And of course, Tyrion Lannister could be paired with her. Given Tyrion's intelligence and Lysa's paranoia, a fanfiction exploring their encounters and how they interact could be full of drama and unexpected twists.
One interesting fanfiction could be about Lysa Arryn's early life in the Vale before the events of the series. It might explore her relationship with her family and how it shaped her into the character we see in the show. Another could be a what - if scenario, like what if Lysa Arryn had allied with a different house instead of the Lannisters. There are also fanfictions that focus on her relationship with Littlefinger in more depth, showing the manipulations and her emotional turmoil in that relationship.
In a 'Game of Thrones' fanfic, the Arryn Brightflame heir could be a completely new character created by the fanfic author. Without reading the specific fanfic, it's hard to say exactly who this heir is. It might be related to the Arryn family somehow, perhaps a long - lost relative or a new claimant to their lands and titles.
It could lead to a whole new power dynamic in the story. Lysa's character might become more influential or vulnerable depending on how their relationship develops.
If Lysa loved Jon, it might cause a lot of drama and complications. It could affect the relationships with other characters and potentially alter the course of events.
One common theme is family loyalty. Since the Tullys are known for their strong family bonds, oc male characters often have to navigate between their personal desires and the needs of the family. For example, in many fanfictions, they might have to choose between a love interest that the family doesn't approve of and staying true to their family.
Adventure themes are also quite popular. They could be on an adventure together, facing various challenges and relying on each other's strengths to overcome difficulties. This kind of theme can add excitement and action to the fanfic.