Well, it could be about a character finding love and protection in the arms of a king. Maybe a commoner girl who catches the king's eye and is then thrust into the dangerous and glamorous world of the court.
Perhaps it explores the power dynamics at play. The king could use the person in his arms as a pawn in his political games. Or it might show how the character in his arms tries to influence the king's decisions for the betterment of the kingdom or for her own interests. This fanfiction could also delve into the jealousy and intrigue among the other nobles who see this special relationship between the king and this person.
It could be about a character finding solace and protection in the king's arms. Maybe a love story between a commoner and the king, defying the odds and social hierarchies in the brutal world of Game of Thrones.
Another possibility is Cersei and Jaime. Their relationship is already very complex and twisted. In a fanfiction, it could be a different take on their relationship where Jaime is seen more as a king - like protector to Cersei, and she finds herself in his arms in a more tender and loving way than their usual dynamic in the show.
The king, of course, would be one of the main characters. It could be any of the kings from the 'Game of Thrones' universe, like Joffrey, who was cruel and unpredictable, or perhaps a more noble king like Stannis. The other main character would likely be the person in the king's arms. This could be a new character created for the fanfiction, or it could be an existing character from the show or books, like Sansa who was often at the mercy of different lords and kings.
One possibility is that Gendry discovers a way to turn Melisandre's powers against her. Given his determination and the fact that he was wronged by her in the show. He could use her own magic or her beliefs to undermine her. For example, if he found out more about the true nature of her powers and how they are related to her god, he could use that knowledge to his advantage.
In a more detailed scenario, the captive could be a noble from one of the Seven Kingdoms. This would cause a great stir as different factions would debate whether to rescue the person or not. Some might see it as a suicidal mission, while others would see it as a chance to prove their bravery. Meanwhile, the captive could be trying to find a way to escape on their own, maybe by befriending one of the less intelligent wights or finding a weakness in the White Walker's magic.
It could be a story where blinking is a sign of weakness. So characters have to train themselves not to blink in certain situations. For example, when facing the White Walkers, not blinking could be a way to show dominance or resistance.
The new lord of Moat Cailin in fanfiction could be a great hero. He might use his position to improve the lives of the people there. He could start by strengthening the defenses of Moat Cailin, making it a more formidable stronghold. He may also establish trade routes, bringing prosperity to the area. This could attract more people to come and live in Moat Cailin, increasing its power and influence in the North. And he could form alliances with other noble houses, not just for military purposes but also for cultural and economic exchanges.
Well, the characters could exchange skills. The sailors from 'The Last Ship' might teach the people of Westeros about navigation and modern weaponry. In return, the Westerosi could show them the ways of courtly intrigue and the use of magic if there is any left. This interaction could create some really unique plotlines.
In some fanfictions, when Jon Snow meets Daenerys, they immediately form a powerful alliance. Their combined strength in terms of leadership and military might makes them a force to be reckoned with. They start to respect each other's claims to the Iron Throne and see that by working together, they can bring about a better future for Westeros.
It could be quite a wild and unpredictable experience. The person might struggle to understand the alternate world and its rules.