The last wish might be related to the White Walkers. If Arryn wishes to stop them before they become a major threat, it would change the whole narrative of the fanfic. There would be no need for the great battle against them, and characters who died in that battle could be alive, leading to new storylines.
Arryn's last wish could also impact the fanfic by altering the political landscape. For example, if the wish is to make Daenerys a more benevolent ruler from the start. She might not have made some of the controversial decisions she did in the original story, which would have led to different reactions from the people and other rulers.
It could be something related to preventing the deaths of beloved characters. Maybe Arryn wishes to save Ned Stark from being beheaded, which was a turning point in the series. This would change the entire course of the story, as Ned's death led to so many other events.
One way to make it compelling is to have the last wish be unexpected. Instead of the typical wishes like saving a loved one, make it something unique. Maybe a character wishes to destroy a powerful magical artifact that has been causing more harm than good. Also, give the character obstacles in trying to fulfill their last wish. This could include other characters who oppose them for various reasons.
The last wish might be related to relationships. A character could wish to reconcile with a loved one before death. In the complex world of 'Game of Thrones' fanfic, where politics and power often come between people, this would add a lot of emotional depth. For instance, a Stark wishing to make peace with a Lannister family member.
Arryn could be a member of House Arryn, known for their loyalty and strategic thinking. Maybe he's a young knight who has heard tales of Princess Elia's beauty and kindness and is inspired to save her.
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.
One great 'Game of Thrones Robert Arryn Fanfic' is 'The Rise of Robert Arryn' which shows his growth and development in a more positive light. It gives him some agency and intelligence that he didn't really get in the show.
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.
The 'Game of Thrones' world is vast and full of possibilities in fanfiction. Regarding Jon Arryn's wife in a Blackfyre - related fanfic, it's likely that the fanfic author has crafted a unique story. It could be that the wife is a character who is a part of a secret Blackfyre plot, or she might be a noblewoman from a house that has some connection to the Blackfyre legacy. However, without actually delving into the fanfic, we can only speculate about who she might be.
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.
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.