There could be a new threat from beyond the Wall. Maybe some other ancient and powerful force was awakened during the chaos of the Game of Thrones events. This could bring together the different kingdoms once again, this time to face a common external enemy.
One possibility could be the rebuilding of Westeros. After all the destruction and power struggles, the remaining kingdoms might focus on restoring their lands, economies, and populations. New leaders could emerge who are more interested in peace and cooperation rather than conquest.
One possible storyline could be that Cersei's daughter rebels against her mother's tyrannical ways. She might see the destruction Cersei has caused and decides to take a different path, perhaps allying with the Starks to bring peace to Westeros.
A storyline could involve Gendry using his new - found princely status to bring about change in Westeros. He might focus on improving the lives of the common people, as he has seen their hardships up close. This could put him at odds with the more traditional and self - serving noble houses. He could also be involved in rebuilding parts of Westeros that were damaged during the wars, using his resources and influence as a prince.
One possible storyline could be that Arya, being the resourceful character she is, tries to figure out how to hatch the dragon egg. She might embark on a journey to find ancient knowledge or a sorcerer who could help her. Maybe she faces many challenges along the way, like being hunted by those who want the egg for themselves.
Well, perhaps in the rough world of Westeros, during a fight between two squires in training, one might give the other a wedgie as a mean prank. Maybe a young Stark boy gets a wedgie from a Lannister page during a tense moment at King's Landing.
Maybe there could be new threats emerging from the far corners of the known world. Some say there could be other powerful civilizations or magical creatures that were previously hidden. It would be a whole new adventure for the characters or their descendants to face these threats and protect Westeros once again.
One possible alternate storyline could be that Robert manages to uncover the truth about Cersei's infidelity earlier. This would lead to a major political upheaval in King's Landing. He might exile Cersei and her children, which would change the power dynamics completely. With no Lannister influence at court, Ned Stark might have more sway, and the events leading to the War of the Five Kings could be averted.
Well, Goku could enter the Game of Thrones world during one of his training sessions where he accidentally travels through dimensions. In this new world, he would find the concept of the Iron Throne and the power struggle very strange. But his nature would make him oppose tyrants like Joffrey. He might start his own 'Saiyan - style' kingdom where strength and honor are the main values. His interactions with characters like Tyrion would be interesting, as Tyrion is a smart strategist and could potentially learn from Goku's combat skills while Goku could learn about the complex politics from Tyrion.
A 'Game of Thrones' future fanfic might explore the consequences of the events in the original series. For instance, if Jon Snow's true identity becomes widely known, how would that reshape the political landscape? Some might see him as the rightful heir and support his claim to the Iron Throne, while others might oppose him out of fear or self - interest. Also, the White Walkers' threat might not be fully over, and there could be a resurgence of the undead in a different form.
One possible plot could be that a giantess emerges from the far North, beyond the Wall. She could be a remnant of an ancient race. The characters in the Game of Thrones world might initially see her as a threat. For example, the Night's Watch could fear she is allied with the White Walkers. But as the story unfolds, it turns out she has her own motives. Maybe she is seeking a lost relic that was stolen from her kind long ago. And she might form an unexpected alliance with a group of outcasts in Westeros to achieve her goal.
In a 'Game of Thrones Epilogue Fanfiction', it could be about the adventures of the next generation. The children of the main characters might discover new threats or mysteries. For instance, they could find hidden secrets about the White Walkers that were not fully explored in the original series, leading to a new quest.