Perhaps the marriage is part of a grander prophecy. In the fanfiction, it could be foretold that a union between Rhaenyra and a Stark will bring about a new era of peace and prosperity. But there are forces that don't want this to happen. Dark wizards or power - hungry lords try to stop the marriage. This would set up a conflict where Rhaenyra and the Stark have to overcome these obstacles together.
One possible plot twist could be that the Stark she marries has a secret power or ability. Maybe he can communicate with animals like some Starks in the lore. This would add an interesting dynamic to their relationship as Rhaenyra comes from a different world in terms of magic and abilities. It could also lead to political intrigue as other houses might be jealous or fearful of this union and the new powers it could bring.
A plot twist could be that the Stark family initially opposes the marriage. Despite Rhaenyra's status, they might have their own reasons like concerns over loyalty to their northern traditions. However, through a series of events, the Stark she is to marry falls in love with her and has to fight his own family to make the marriage happen. This would create a Romeo - Juliet - like situation within the context of the Game of Thrones universe.
Maybe there could be a plot twist where Ned discovers that Ashara has a hidden power. This power could be something magical that is feared in the Seven Kingdoms. Ned has to decide whether to protect her from those who would seek to use or destroy her because of this power, and how this affects their relationship.
Perhaps the plot twist is that Gregory Stark is from an alternate universe where the rules of physics and technology are different. His methods of saving Tony Stark seem strange and dangerous at first, but in the end, they lead to a revolutionary breakthrough in both Stark's personal technology and the way the world views superheroes.
One possible plot twist could be that their families oppose the marriage at first. Maybe Ranma's father has some old feud with Ryoga's family that they need to overcome. Another twist could be that a third character, who has feelings for either Ranma or Ryoga, tries to break them up. For example, Akane might realize she still has feelings for Ranma and tries to stop the wedding.
One possible plot twist could be that Gaston has a change of heart and realizes the error of his ways. He starts to see Belle not just as a trophy to be won, but as a person with her own dreams and desires. This newfound understanding could lead to a more complex relationship where he tries to make amends for his past behavior and truly win her heart in a more honorable way.
One possible plot twist could be that Lily marries Snape out of a sense of duty. Maybe she discovers some long - hidden secret about Snape's past that makes her feel obligated to stand by him. For example, if she finds out that he made a great sacrifice for her family in the past that no one else knew about. Another plot twist could be that it's a marriage of convenience. The wizarding world is in danger, and their union is seen as a way to bring two powerful magical lineages together to fight against a common enemy. Or perhaps Snape has some unique magical ability that Lily needs in order to achieve a certain goal, and marriage is the only way to access it.
Another plot twist could be that an enemy uses their relationship against them. The enemy could spread rumors or false information to create chaos and turn the ninja world against them. Naruto and Sasuke would then have to fight not only to protect their relationship but also to clear their names and prove that their love doesn't mean harm to the ninja world.
One possible plot twist could be that the Dragonborn's dragon powers start to have an unexpected effect on the Khajiit. Maybe her feline instincts are enhanced in strange ways. For example, she could become overly protective of the Dragonborn, sensing threats from the most unexpected sources. Another plot twist might be that the Khajiit has a hidden past related to an ancient Khajiit prophecy. This prophecy could somehow be intertwined with the Dragonborn's destiny, and as they get married, they start to uncover secrets that put their relationship and the entire world in jeopardy.
Well, a plot twist could be that Margaery is actually in love with someone else, like Renly, in her heart but still marries Jon for the sake of her family's political ambitions. But as she gets to know Jon, she starts to have conflicting feelings. Jon, on the other hand, might be hesitant about the marriage at first because of his loyalty to the North and his own past relationships. Maybe he still has feelings for Ygritte. As the story progresses, they have to navigate these complex emotions while also facing challenges from other political powers who don't want to see their union succeed.
One possible plot twist could be that just before the wedding, Kate discovers a long - lost relative who has some dark secrets that could potentially affect her relationship with Josh. This relative might try to interfere with the wedding for their own reasons.
One possible plot twist could be that the new marriage is a political alliance. For example, if he marries a noblewoman from a far - off land, it could bring new resources and allies to his kingdom. This would create a whole new set of power dynamics as different factions within the court would either support or oppose the new alliance.