One popular 'jon arryn oc son fanfiction' might be the one where the OC son is on a quest to uncover the secrets of his father's past. It often has elements of mystery and adventure.
There could be a 'jon arryn oc son fanfiction' where the OC son has to navigate the complex political landscape of the realm. In this story, he uses his wits and unique skills to gain allies and overcome enemies. This type of fanfiction usually delves deep into the politics and power struggles within the fictional world.
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.
When writing a 'jon arryn oc son fanfiction', it's important to research the world in which the story is set. Know the politics, the culture, and the other characters. For example, you should understand the power dynamics in the area where Jon Arryn held influence. You can then build your plot around how the OC son fits into this world. Maybe he wants to continue his father's legacy or break free from it. Also, don't forget to add some conflict, like an enemy or a difficult situation that the OC son has to face.
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.
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.
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.
There might be a sharra arryn oc targaryen fanfic that delves into a romantic relationship between the oc and a Targaryen. It could explore how their different backgrounds, with Sharra being from House Arryn and the Targaryen having their own unique heritage, create both challenges and a unique bond in the story.
One great 'Jon Snow oc fanfiction' is 'A New Beginning for Jon Snow'. It presents an interesting take on Jon's life with an original character who helps him in unexpected ways. Another is 'Jon Snow and the Lost Soul' which delves deep into his character and how he interacts with a unique oc. And 'Jon Snow's Unlikely Alliance' also stands out, as it shows a different side of Jon through his relationship with the oc in the story.
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.
One popular story could be 'Robb and Jon's Unlikely Alliance'. In this fic, an original character (OC) gets involved in the relationship between Robb and Jon. The OC might be a healer who comes to their aid during a battle, and through her, new dynamics are explored between the two brothers.