One interesting plot twist could be that Severus and Harry are forced to marry for political reasons in the wizarding world. Maybe there's a threat from a dark force and their union is seen as a way to unite different factions. Another could be that they initially hate the idea but gradually fall in love as they discover things about each other they never knew. For example, Harry might learn about Severus's deep - seated loyalty to Dumbledore and Severus might see Harry's strength beyond his Gryffindor bravado.
Well, in some fanfictions, a plot twist could be that they marry in a parallel universe where the events of the original series are completely different. For instance, Voldemort was defeated in a different way and the social structure of the wizarding world has changed. So Severus and Harry's marriage is part of a new social experiment. Also, there could be a plot twist where they get married because of a magical bond that was unknowingly created between them, and they have to figure out how to deal with it while also dealing with their own feelings and the reactions of others in the wizarding community.
A possible plot twist is that Severus and Harry are both under a spell that makes them believe they are in love and get married, but as the story progresses, they start to question their feelings. However, during this process of doubt, they actually start to develop real feelings for each other. Another plot twist could be that their marriage is part of a prophecy that they initially don't believe in. As they live together and face various challenges, they realize that their union is crucial for the future of the wizarding world, which completely changes their perspective on their relationship.
In some fanfictions, a great plot twist is when Draco is on the verge of making a really bad decision, like joining the Death Eaters completely. But then he discovers his true relation to Severus. This changes his perspective as he realizes Severus has been secretly protecting him all along. It makes him question his loyalty to the Dark side. Also, there could be a plot twist where Severus has to choose between his loyalty to Dumbledore and protecting his son Draco, which creates a lot of internal conflict for him.
Perhaps a plot twist could be that the Ministry of Magic tries to interfere with Harry's pregnancy because they fear the implications it might have on the wizarding society. They could try to force Harry into hiding or even attempt to separate him from Charlie. However, Harry and Charlie, with the help of their friends, fight back against the Ministry's unjust actions. This would not only create a lot of drama but also show the strength of their relationship and their determination to protect their family.
Perhaps in the fanfiction, Draco Malfoy turns out to be a double agent. He pretends to be on the side of the Death Eaters like his family, but in reality, he is secretly helping Harry Potter and the Order of the Phoenix. Snape discovers this and has to decide whether to expose Draco or use his secret to their advantage. This would create a lot of tension and unexpected alliances.
In these fanfictions, the relationship often starts with a lot of tension. Harry may be suspicious of Severus at first, given their past in the original story. But as they spend more time together, they start to see each other in a new light. For example, Severus might show his softer side to Harry, like his love for potions and his hidden sense of humor. Harry, in turn, might show Severus his more mature and understanding side, different from the bratty kid Severus used to see.
A possible plot twist could be that the demon Naruto marries is actually a reincarnation of an ancient and powerful being, which brings a whole new level of danger and mystery to the story.
In certain fanfictions, a plot twist is that Harry doesn't kill Voldemort directly. Instead, he uses his love and friendship magic in a very unique way. He manages to make Voldemort see the error of his ways, and Voldemort sacrifices himself to undo all the evil he has done. This is a very different take from the usual 'kill or be killed' scenario. Another interesting plot twist could be that the killing of Voldemort reveals a long - hidden prophecy about Harry that has nothing to do with the original prophecy, and this new prophecy sets Harry on a whole new path of discovery and adventure.
In some of these fanfictions, a really cool plot twist is that Fem Harry has an unknown magical heritage on her mother's side that gives her powers that are very different from normal wizarding abilities. This makes her stand out even more in the Weasley family. The Weasleys then have to deal with the jealousy and envy of other wizarding families who want to use Fem Harry's powers for their own gain. Also, she might be able to communicate with the portraits in Hogwarts in a way that no one else can, which leads to her getting crucial information about the school's history and secrets.
Well, in some fanfictions, a plot twist might be that Draco and Harry are forced to marry by a magical contract that was hidden for ages. And as they try to break it, they actually fall in love. Or perhaps a twist where Draco is actually a spy for the good side all along and their marriage is part of a grand plan to expose the remaining Death Eaters. There could also be a twist where Harry loses his memory and Draco has to make him fall in love with him all over again while dealing with the wizarding world's reaction to their union.
One interesting plot twist could be that Jasper's vampire abilities are used to protect Harry from a new and unexpected dark magic. For example, Jasper might be able to sense a dark wizard's intentions before they attack Harry. Another twist could be that they discover a hidden connection between the wizarding world and Jasper's vampire world, like a shared ancient magic that only they can unlock together. It could also be that Jasper's ability to control emotions helps Harry deal with his own inner turmoil caused by Voldemort's presence, in a way that no one else in the wizarding world can.
A really interesting plot twist could be that Snape was under a spell all along that made him seem so cold and distant, and Hermione discovers it. This changes the whole dynamic between them. Another twist could be that Hermione is actually related to someone from Snape's past in a way that they never expected, which brings them closer.