In this kind of fanfiction, a really interesting plot twist could be that the princess and the prince are from two warring kingdoms. The forced marriage is seen as a way to end the war. But as they get closer, they find out that there are other forces at work trying to keep the war going. So, they have to not only deal with the forced aspect of their relationship but also figure out who is behind the plot to keep their kingdoms at war. This could involve them going on a secret mission together and falling in love in the process, which completely changes the nature of the forced marriage.
One possible plot twist could be that Bella discovers Edward has a secret identity that is not what it seems, like he's part of a supernatural group she didn't know about. This could change her perception of the forced marriage and add a whole new layer of drama.
The princess might resist by using her intelligence. For example, she could expose some dark secrets about the prince or the people forcing the marriage. If she can prove that the prince has a bad character or that there are ulterior motives behind the marriage, it could stop the forced union. She could also use her charm to win over the public. If the people oppose the forced marriage, the rulers might have to reconsider. And she could form an alliance with other kingdoms who are against this forced marriage.
One possible plot twist could be that the baby has some sort of special power. Maybe it's a power that is not known in their world and it causes all kinds of chaos and confusion. People might be scared or intrigued by the baby.
One possible plot twist could be that the secret twin has been living in the Muggle world all this time. When Draco discovers his twin, he has to navigate the challenges of introducing a Muggle - raised sibling into the wizarding world. This could cause a stir in the Malfoy family, as they have strong pure - blood beliefs.
A possible plot twist might be that the force behind the marriage is actually an ancient evil that wants to use their union to gain power. Artemis and Percy then have to team up to not only deal with the unwanted marriage but also defeat this evil. It could also be that Artemis has a way to break the forced marriage bond, but in doing so, she would lose her immortality, which adds a huge moral dilemma to the story.
Well, one plot twist could be that Hiccup discovers a long - lost family secret that changes the whole reason for the forced marriage. Maybe his family has a hidden alliance with Astrid's family that he was unaware of. Another could be that Astrid herself is against the forced marriage at first but then realizes she has real feelings for Hiccup during the process of getting to know him better. Or perhaps there's an outside force, like a villain, who is trying to use the forced marriage to their advantage but Hiccup and Astrid end up joining forces against them.
One plot twist could be that the princess is actually a spy. She was planted to be 'captured' so that Naruto would come to save her and lead the rescuers into a trap. But Naruto, being observant, notices some small details that give her away and he has to turn against her to save himself and his comrades.
One possible plot twist could be that Naruto is initially in love with someone else, like Sakura. Hanabi's attempts to win him over could lead to some interesting rivalries and misunderstandings. For example, Sakura might see Hanabi as a threat and try to sabotage her efforts, creating drama.
Maybe the 'paying death' is a ruse. Death is actually an entity that wants to test Harry's worthiness to time travel. So, Harry is made to go through a series of trials where he thinks he's paying death but in reality, he's just proving his courage, intelligence and loyalty, which are the real keys to time travel in this fanfiction.
Another aspect could be an unexpected bond forming between Hermione and the Death Eater. As they are forced to spend time together, they might start to understand each other on a deeper level. This could lead to a moral dilemma for the Death Eater, especially if he starts to develop feelings for Hermione. He would then have to choose between his loyalty to the Death Eaters and his new - found connection with her.