A popular pairing is Thor and Jon Snow. They are both strong leaders and warriors. Thor could teach Jon about his Asgardian powers and fighting techniques, while Jon could show Thor the harsh realities of survival in Westeros. Their bond could be a powerful force in a fanfiction story.
Definitely Tony Stark and Tyrion Lannister. They are both intelligent, witty, and a bit of an outcast in their own worlds. Fans love to imagine them coming together, sharing their knowledge and maybe even coming up with some grand plans to either take over Westeros or save the world from some new threat.
Natasha Romanoff and Arya Stark are often paired in fanfiction. Natasha's assassin skills and Arya's determination to avenge her family make them a great combination. They could train together, share stories of their pasts, and maybe even team up to take on the bad guys in both the Avengers' world and the Game of Thrones world.
Sansa Stark could also be paired with the prince. Sansa's knowledge of the North and her diplomatic skills could complement the prince's own abilities. Their relationship could be a slow - burn one, starting from mutual distrust to a strong alliance as they face common enemies in the fanfiction.
One of the most common pairings is between Daenerys Targaryen and Spartacus. Daenerys is a powerful leader with her dragons, and Spartacus is a symbol of the fight for freedom. A fanfiction could explore how they join forces, with Spartacus' gladiators and Daenerys' Unsullied fighting side by side. Also, Jon Snow and Agron are sometimes paired. Jon Snow's sense of duty and Agron's loyalty could be combined in a story where they lead their respective groups in a great battle against a common enemy.
Theon Greyjoy can also be an interesting character to pair with Sansa. Their complex relationship can be developed further in fanfiction. Maybe Theon is trying to make amends for his past actions towards Sansa and they end up forming an unexpected alliance to face common enemies.
In some fanfictions, Gendry is paired with Melisandre. Given her mysterious nature and her past interest in Gendry in the show, it makes for an interesting pairing. Their relationship could be explored in terms of power, magic, and the manipulation that might occur between them as they navigate the complex world of Westeros.
Jon Snow is another character that might be paired with Asher. They are both outsiders in a way. Jon being a bastard and Asher having his own family issues. They could bond over their shared experiences and fight together against the common threats in the Seven Kingdoms, like the White Walkers or the power - hungry lords.
Definitely Harry Potter and Daenerys Targaryen. Harry is the hero of his world and Daenerys is a powerful queen. Their meeting could lead to all sorts of interesting stories, like them sharing their experiences of leading and fighting for what they believe in.
His sisters, Visenya and Rhaenys, are often paired with him. In many fanfictions, they play crucial roles in his conquest. Their relationships with Aegon are complex, and writers like to explore how they support and sometimes compete with him.
Arya Stark is often paired with tigers in fanfiction. Given her independent and fierce nature, it makes sense that she would be associated with such a powerful animal. Another could be Jon Snow. His connection to the wild and his leadership qualities could be enhanced by having a tiger as an ally in fanfiction.
In some cases, the Mountain might be paired with other powerful warriors from different regions in fanfiction. For example, a character from Essos who has a unique fighting style. This could lead to some epic battles and exchanges of combat techniques in the fanfiction.