Daenerys might also be affected. If word reaches her that Oberyn has won and is making changes in Westeros, she might see an opportunity to form an alliance with him. She could offer her dragons and her army in exchange for a share of power in Westeros. This could lead to a very different endgame for the series, with multiple powerful players working together or against each other in new ways.
The comic adaptation of Oberyn in Game of Thrones is quite interesting. It manages to capture his essence and personality pretty well.
If Robb won the war in a fanfic, it could lead to a completely different Westeros. He might establish a more just rule in the North and perhaps even expand his influence over other kingdoms. Maybe he'd form new alliances and bring about an era of peace and prosperity, unlike the chaos that followed in the original series.
The characters' fates would be drastically different. Daenerys might not have to go through all the hardships she faced in the original story as she could grow up in a more stable Targaryen - ruled Westeros. Tyrion could find himself in a court that values intelligence more, given Rhaegar's own intellectual pursuits.
In a fanfic, if Oberyn wins, he may also decide to take Sansa Stark under his protection. He could see her as a key to future political stability. With Sansa in Dorne, he could use her claim to the North to form a coalition against the Lannisters, uniting the North and Dorne against their common enemy.
There is a fanfiction called 'Oberyn's Quest'. It follows Oberyn on a journey across Westeros where he uncovers some long - forgotten secrets. The story does an excellent job of staying true to his character, his determination and his cunning nature, making it a great read for Oberyn Martell fans.
If Rhaegar won in a 'Game of Thrones' fanfic, perhaps he could have restored the Targaryen dynasty to its former glory. He might have been able to bring about a more peaceful reign, with his love for music and the arts influencing the court. He could also have made different alliances, changing the political landscape of Westeros completely.
If Rhaegar were to win in a 'Game of Thrones' fanfic, it would change the fates of many characters. For example, Ned Stark's life would be different. He wouldn't be on a quest for revenge against the Targaryens for his sister's supposed abduction. Instead, he might be serving under Rhaegar in some capacity, perhaps as an advisor or a military leader in the North. The Lannisters would also have to re - evaluate their position. Their plans for power might be thwarted as Rhaegar would be in control. Jaime Lannister might not become the Kingslayer in the same way, and Cersei's ambitions for the throne would be dashed. Overall, the power dynamics in Westeros would be completely reshaped with Rhaegar's victory.
In a fanfic where Robb wins the war, the Stark family's reputation would be greatly enhanced. Robb would be seen as a great leader. He might also start to reform the feudal system in Westeros. For instance, he could give more power to the smallfolk, which would be a revolutionary change. This could lead to a more democratic - like system in the long run. He would also have to deal with the remaining enemies who might be plotting revenge, so he would need to keep a strong military presence.
In the show, Oberyn Martell was a complex and charismatic character. His flamboyant style, his confidence, and his intelligence made him stand out. Fanfiction writers are attracted to such a character as they can create different scenarios for him. For example, some fanfictions might have him survive his fight with the Mountain and change the course of the entire 'Game of Thrones' story, which is very appealing to fans.
If Rhaegar won in the 'Game of Thrones' fanfic, perhaps the Targaryen dynasty would be restored to its former glory. He might bring about a more just rule, with less bloodshed compared to the chaotic events that unfold in the original series. He could also potentially reunite the Seven Kingdoms under one banner more peacefully, using his charm and leadership skills.