One interesting plot twist could be that the marriage is part of a dark wizard's plan to gain control over the wizarding world through Harry. But Harry discovers a hidden prophecy that gives him the power to turn the situation around and expose the dark wizard's true intentions.
In some fanfictions, the forced marriage could lead to a complete transformation of the wizarding world's social structure. For example, if Harry is forced to marry someone from a long - forgotten pure - blood family, it might stir up old rivalries and alliances. This could result in a re - evaluation of blood purity concepts and the formation of new power dynamics. It could also make Harry question his own beliefs about equality in the wizarding world as he navigates this complex situation.
One interesting plot twist could be that they discover a hidden prophecy that states their union is the key to saving the wizarding world from a new, unknown threat. So, despite their initial resistance, they start to work together to fulfill this prophecy. Another could be that a powerful dark wizard has cast a spell on them, but as they try to break it, they actually start to understand each other better and form a real bond.
One possible plot twist could be that it's all a part of a dark wizard's plan to gain control over the wizarding world through their union. Maybe the dark wizard has some ancient magic that can be harnessed only if Harry and Ginny are married against their will. Another twist could be that it was a misinterpreted prophecy that led to this forced situation, and as they struggle against it, they discover new aspects of the prophecy that change everything.
One possible plot twist could be that Harry discovers the marriage is part of a dark wizard's plan to gain control over him. Maybe the dark wizard wants to use Harry's fame and power within the wizarding world for their own evil deeds. Another twist could be that the person he is forced to marry is actually an undercover ally who is trying to protect Harry from a greater threat. For example, she might be pretending to be part of the forced marriage scheme but is actually working with Dumbledore's old network to keep Harry safe.
Maybe the forced marriage contract was set up by a well - meaning but misinformed wizard in the past. Harry initially resists but then realizes that the person he's supposed to marry has some crucial information about his parents. So, he decides to work with her within the bounds of the contract to uncover the secrets. And along the way, they actually start to develop real feelings for each other.
One possible plot development could be Harry initially resenting the forced marriage but then gradually realizing Ginny's true worth. For example, through shared adventures in the wizarding world that they are forced to embark on together, he sees her courage and loyalty in a new light.
One interesting plot twist could be that Remus, being a werewolf, has to constantly protect Harry from those who fear his lycanthropy. This could lead to them having to constantly move, creating a nomadic lifestyle for Harry. Another could be that Remus teaches Harry different magic that is more in line with his own values, which might put Harry at odds with the traditional Hogwarts curriculum.
One interesting plot twist could be that Narcissa uses her influence in the wizarding world to protect Harry from the dark forces in a way the Dursleys never did. Maybe she secretly trains him in dark arts defenses that are not part of the Hogwarts curriculum, which gives him an edge later on. Another could be that Harry's presence in the Malfoy household causes a rift between Narcissa and Lucius, as Lucius is still loyal to Voldemort at first and doesn't trust Harry. This could lead to some tense family drama within the Malfoy manor.
Well, a really cool plot twist could be that the Malfoys, who are raising Harry, actually start to change because of him. They become less prejudiced against non - pure - blood wizards. And Harry, in turn, uses his influence within the Malfoy family to bring about positive change in the wizarding world. It would be a complete turnaround from the original relationship between Harry and the Malfoys in the original series.
A possible plot twist is that when Harry is bitten, he starts to have visions of the vampire's past. This leads him to discover a long - forgotten prophecy about a vampire - wizard hybrid saving the wizarding world. Also, his friends initially think he's turned evil due to the vampire bite, but in reality, he's just trying to figure out how to use his new state to fight the real threats in the wizarding world. It could also be that the bite makes Harry age backwards, which causes all sorts of chaos in the wizarding world as people don't recognize him and he has to re - establish his identity.
One possible plot twist could be that the love potion was actually a misidentified antidote to a much more dangerous magical poison. So, while everyone thinks Harry is under the spell of love, he's actually being cured of something else. Another could be that the person who poisoned him with the love potion was unknowingly being controlled by a dark wizard who wanted to use Harry's new 'affections' to manipulate him into doing something dangerous.