Maybe the memories weren't really removed but rather hidden in a way that only a certain powerful magic can unlock. And when they start to surface, they bring with them a dark secret that could change everything. It could be related to an evil entity that was using Hermione's time - travel for its own gain.
A possible plot twist could be that the person who removed her memories was actually her future self trying to protect the timeline. This would add a whole new layer of complexity to the story.
One great fanfic on this topic is 'Time's Erasure'. It delves deep into how Hermione copes without those memories and how it impacts her relationships. The author does an amazing job of showing her confusion and the slow realization that something is amiss.
One plot twist could be that her secret father is actually an enemy in disguise. He might have some evil plan that involves Hermione unknowingly.
One possible plot twist could be that Draco's family initially opposes the marriage. His pure - blood - supremacist parents might have a hard time accepting Hermione, a Muggle - born. Another twist could be that there are dark forces at play trying to use their union for some evil purpose, perhaps related to an ancient prophecy. And a third twist could be that Hermione discovers a long - lost family secret that has some connection to the Malfoy family, which changes the dynamics of their relationship and the marriage.
Perhaps a plot twist could be that the time - travel device they use was actually created by an ancient and forgotten wizard who had a hidden agenda. When Hermione and Lucius travel back, they discover that this wizard was trying to use them to change history for his own gain. They then have to race against time (literally) to stop this wizard from achieving his goal while also trying to return to their own time. This would add an extra layer of mystery and danger to their time - traveling escapade.
Well, a really interesting plot twist could be that when Voldemort controls Harry, Harry's personality starts to merge with Voldemort's in unexpected ways. For example, Harry might start to understand Voldemort's motives and see some truth in his views about the wizarding world, which creates an internal conflict for Harry. Another plot twist could be that the magic used to control Harry has a side - effect that it also starts to affect Voldemort's own magic in unforeseen ways. Maybe it makes Voldemort more vulnerable or changes his appearance. And there's always the chance that the control is not just a simple spell but a complex magical ritual that was set in motion long ago, and Harry has to figure out how to reverse the entire ritual to break free.
One possible plot twist could be that Draco actually has noble intentions behind the kidnapping. Maybe he's trying to protect Hermione from a greater threat that she's unaware of. For example, there could be a dark wizard targeting her specifically, and Draco, despite his past enmity, decides to take matters into his own hands to keep her safe.
One possible plot twist could be that in the time - traveling process, Jason Todd's past actions get altered in a way that completely changes his relationship with Terry McGinnis. For example, if he had made a different decision in a key moment in his past that was related to a future event involving Terry. Another twist might be that the time travel mechanism itself is faulty, and they end up in a completely different time period than they intended, like a dystopian future or a pre - historic era. This would force them to work together in an unfamiliar environment and face new challenges.
Perhaps they time travel to a period when a great evil was first emerging. They then have to figure out a way to stop this evil from taking root without using the knowledge and power they have in their own time. This could involve finding and training local ninja in the past to fight against this new threat, and in the process, they learn new techniques and strategies that they can bring back to their own time.
One plot twist could be that Naruto discovers secrets about the Uchiha clan through Minato's memories. Since Minato was Hokage and involved in village affairs, he might have known things about the Uchiha that were never revealed. Another could be that Naruto uses Minato's memories to find a new way to deal with the tailed beasts, perhaps a more peaceful co - existence method that Minato had been thinking about but never got to implement. Also, he could use Minato's memories to expose some traitors in the village who had been hidden for a long time.
Perhaps Snape and Hermione were secretly working on a time - traveling potion project. Due to some unforeseen consequences of time manipulation, Hermione ended up pregnant. It could also be that a powerful magical artifact they were studying had some sort of fertility - enhancing effect that they didn't anticipate at first.