The adult son could also change the story through his relationships. For example, if he was married into a powerful family, he could have used that connection to gain more influence. He might have been married to a Tully, strengthening the bond between the Vale and Riverlands. This would have made it harder for the Lannisters to isolate and attack their enemies one by one.
He could impact the story by influencing the Vale. Since Jon Arryn was an important figure in the Vale, his son would have had a certain amount of power and respect there. He might have been able to raise an army from the Vale earlier than what happened in the original story, and this army could have been a deciding factor in battles, like the ones during the War of the Five Kings.
He could have been a key figure in the search for the truth about the White Walkers. Maybe he was more open - minded than some of the other lords. He could have funded expeditions north of the Wall, gathering information about the threat. His knowledge could have convinced more people in the south to take the White Walker threat seriously, changing the overall strategy against them.
One idea could be that this adult son might have been involved in the political intrigue in King's Landing. He could have been a rival to Littlefinger, using his father's influence and his own wits to try and maintain the stability of the realm. Maybe he would have uncovered some of Littlefinger's schemes earlier, preventing some of the chaos that ensued in the series.
Perhaps the OC son has a special ability or gift that Jon Arryn was trying to protect him from being exploited for. After Jon Arryn's death, the son has to learn to control this ability while also dealing with the power struggles in King's Landing. He could be a key figure in the fight against the White Walkers, using his unique skills to help the living, all while trying to uphold his father's legacy.
Suppose Jon Arryn's son forms an alliance with the Iron Islands in fanfiction. This would be a very different scenario from the original plot. With the Iron Islands' naval power and his own claim to power in the mainland, they could create a new power bloc. This could disrupt the balance of power between the other houses and change the way wars are fought and alliances are made in Westeros.
The OC son could start off as a naive and sheltered young man, but after Jon Arryn's death, he is forced to grow up quickly. He becomes more cynical and distrustful of those around him, especially the nobles in King's Landing.
One interesting fanfiction could be about Jon Arryn's son surviving in secret and emerging to claim his father's legacy. He might have been hidden away by a loyal servant and grows up in exile, learning the ways of the world far from the politics of King's Landing. When he returns, he causes a stir as he tries to uncover the truth about his father's death.
Well, if Jon Arryn married a Targaryen in a fanfic, it could completely change the power dynamics in Westeros. For one, it might strengthen the position of House Arryn, as the Targaryens have a powerful lineage. This union could potentially lead to different alliances. Maybe they would have had children who could have been claimants to the Iron Throne, adding more chaos to the already complex web of power struggles. Also, it could change the relationship between the Vale and other regions. The Vale might become more involved in Targaryen - related matters, like the fight for the throne or the conflict with the other Great Houses.
The plot could involve a time - travel or alternate universe scenario. Maybe Blackfyre is brought to the present time in the Game of Thrones story (or an alternate version of it), and Jon Arryn marries her out of love. Their relationship then has to face the challenges of the existing power structures, the plots of other houses, and the secrets that Blackfyre might carry from her own past. This could lead to a whole new set of alliances and enmities within the Seven Kingdoms.
Yes, there might be. The Game of Thrones fandom is vast, and many creative fanfics exist. You can start by looking on popular fanfic websites like Archive of Our Own or FanFiction.net.
Well, he could be a character who has been reimagined. Jon Arryn in the original series was an important figure. In this fanfic, the 'Brightflame' addition might suggest some sort of connection to a more flamboyant or perhaps magically - inclined lineage. It's possible that he has abilities or a backstory that ties him to this 'Brightflame' concept, which could make him a key player in the fanfic's plot, different from his role in the original story.
The concept of heir in a 'Game of Thrones' fanfic involving Jon Arryn and Brightflame is highly variable. There are so many factors at play. The world of 'Game of Thrones' is full of complex family trees and political relationships. It's possible that an heir could emerge from a previously unthought - of branch of the family. Maybe there's a secret marriage in the past that ties a character to both Jon Arryn and Brightflame in a way that gives them a legitimate claim to be the heir. And then there are the power - hungry lords and ladies who might try to manipulate the situation to their advantage, putting forward their own candidates as the heir, whether they have a real claim or not.