One interesting plotline could be Ramsay's redemption arc. In some fanfictions, he might start to question his cruel ways after meeting a character who shows him genuine kindness. This could lead to a transformation where he tries to make amends for his past deeds.
Some fanfictions might explore Ramsay's relationship with his father Roose Bolton in more depth. There could be a power struggle between them where Ramsay tries to prove himself worthy of inheriting the Bolton name in a way that doesn't involve his usual brutal tactics.
Another plotline could be Ramsay in an alternate universe where he was raised differently. Maybe he was taken in by a more noble family and was taught the values of honor and chivalry. This would completely change his character and how he interacts with the world of Westeros.
Sansa Stark is often paired with Ramsay in fanfiction. Their relationship in the original series was extremely dark, and in fanfiction, some writers might explore a different side of it, like Sansa finding a way to manipulate Ramsay or even Ramsay having some strange form of obsession with her that goes beyond his usual cruelty.
Another plotline might involve Ramsay having a change of heart due to some unexpected event. For example, he could be haunted by his past deeds and start to treat Sansa differently. However, this would be a very complex and controversial change as he is such a cruel character. In this scenario, Sansa would have to decide whether to trust this new side of Ramsay or still seek her revenge.
One plot idea could be Sansa using her wits to outmaneuver Ramsay in the political arena of Winterfell. She could secretly gather allies among the servants and smallfolk who have been oppressed by Ramsay. Another could be a scenario where Ramsay tries to break Sansa's spirit but instead she finds an inner strength that he never anticipated, leading to a power struggle within the walls of the castle.
Well, in some fanfictions, Jon Snow might use his superior sword - fighting skills. He could have a one - on - one duel with Ramsay Bolton and defeat him with his Valyrian steel sword. His determination and the element of surprise could also play a role.
One interesting plotline could be their joint quest to defeat the Night King. They combine their forces, both the Unsullied and Dothraki with the Northmen. Their relationship also evolves during this time, from initial distrust to a deep mutual respect and perhaps something more romantic. They learn from each other's leadership styles and together become a formidable force against the undead threat.
Their relationship could be explored by focusing on Ramsay's insecurities. Maybe Ramsay is actually secretly in love with Sansa in a very twisted way, and his abuse is a result of his inability to handle his feelings. Sansa, on the other hand, could try to use this knowledge to manipulate him.
One possible consequence is that he becomes a hero in the eyes of many. People in the North might see him as their true leader and rally behind him even more. His reputation could spread far and wide, making him a symbol of justice.
One possible plot could be a story where Sansa manages to escape Ramsay's clutches before any harm comes to the baby. Maybe she finds allies within the castle who help her flee with the baby to a safe place, like a hidden forest village.
One interesting storyline could be them uniting the kingdoms in a different way than in the original series. Maybe they find a way to combine their different leadership styles and bring about a more peaceful and prosperous Westeros. For example, Dany's experience with ruling different cities and Jon's knowledge of the North could create a unique form of governance.
One scenario could be that Jon and Daenerys meet earlier in their journeys. Maybe Jon, while on an expedition beyond the Wall, stumbles upon Daenerys and her dragons in Essos. They form an immediate bond over their shared sense of justice and leadership. Daenerys is intrigued by Jon's loyalty to his people in the North, and Jon is in awe of her power and determination.