Some fanfictions focus on the backstories of minor characters. For example, a story about the life of a Night's Watch member before he joined. It could explore his reasons for joining, his family, and how he coped with the harsh life at the Wall. There are also fanfictions that rewrite the end of the series in a more satisfactory way for fans, like Jon Snow actually ruling the Seven Kingdoms in a more just and prosperous manner.
In some Game of Thrones fanfiction, there are alternate universes where magic is more prevalent. Characters like Bran Stark might have even greater powers and use them to prevent the White Walkers from ever becoming a threat. Or there could be a story where Tyrion Lannister discovers a long - lost relative who has a great influence on his life and helps him gain more power and respect in King's Landing.
One interesting storyline could be a crossover where characters from 'Game of Thrones' end up in the world of 'Frozen'. For example, Jon Snow might find himself in Arendelle and have to deal with the magical elements there while also trying to find a way back home. Another could be Elsa using her powers to help in the battles of Westeros.
In some slash fanfiction, there could be a story about Jaime Lannister and Tyrion Lannister having a deeper bond that goes beyond their canon relationship. For example, they could be working together to change the fate of House Lannister in a more positive way while also having a strong emotional connection that has a slash element to it. This could involve Jaime seeing Tyrion's true worth and protecting him more fiercely than in the original series.
One interesting storyline could be a crossover where characters from Game of Thrones interact with historical English figures. For example, Daenerys Targaryen arriving in medieval England and facing off against a powerful English lord. It could add a whole new dynamic to the power struggles we know from the original series.
One interesting storyline could be an alternate version where Ned Stark doesn't lose his head. Maybe he manages to outwit the Lannisters and turn the tables on them early on. This would completely change the power dynamics in King's Landing and the subsequent events in the Seven Kingdoms.
One interesting storyline could be an alternative version of a character's fate. For example, what if Ned Stark didn't die? Maybe he could have found a way to expose the Lannisters' treachery earlier and prevent the war from escalating as it did in the original series. Another could be a fanfiction focusing on the relationship between Daenerys and Jon Snow, exploring how they might have ruled Westeros together if things had gone differently. And there could also be a story about Arya's adventures in Essos that we didn't see in the show, where she uses her skills to help the common people there.
Well, there could be a story where Podrick becomes a key figure in a rebellion. He might use his loyalty and courage to gather support from different factions. For example, he could convince some of the disgruntled knights to join the cause. Additionally, a fanfiction might explore Podrick's adventures beyond Westeros. He could travel to distant lands, encounter new cultures and magic systems, and bring back knowledge that changes the power dynamics in Westeros.
Perhaps a fanfiction where the magic in the conquest was more prominent. Instead of just using his dragons, Aegon has to also deal with powerful wizards and sorceresses from the different kingdoms. This would add a whole new dimension to the conquest story.
One interesting storyline could be a catfight between Cersei and Sansa. Maybe it starts over a political intrigue where Sansa tries to undermine Cersei's power in King's Landing. This could lead to a series of verbal and physical exchanges that show the strong - willed nature of both characters.
One interesting storyline could be a fanfiction where Jon Snow and Daenerys Targaryen's relationship develops in a different way. Maybe they meet earlier and form an alliance based on love rather than just political reasons. This could change the whole dynamic of the story.
One interesting storyline could be about a commoner rising to power in the Game of Thrones RPG fanfiction world. This character, starting from a lowly position, uses their wits and charm to gain allies and climb the social ladder. They might face challenges like betrayal from those they trust, but still manage to make a name for themselves.