Well, a really cool plot twist could be that Ranma's amnesia is only partial. He remembers some parts of his life but misinterprets them. For example, he might think that his constant transformations are part of a normal human experience. This leads to some really hilarious and also poignant moments as he tries to fit into what he believes is normal, while the other characters are both confused and amused by his behavior.
A plot twist could be that Ranma's amnesia is caused by a magical curse that is tied to an ancient prophecy. As he tries to figure out his past, he uncovers secrets about his family's history that were long forgotten. This could involve other characters having to protect him from those who want to use his amnesiac state for their own gain.
One interesting plot twist could be that Ranma forgets not only his identity but also his martial arts skills. This forces him to start from scratch, and in the process, he discovers new ways of fighting that are different from his traditional training. Another twist might be that he forgets his relationships, but starts to fall in love with Akane all over again in a completely new way, leading to a more complex and fresh dynamic between them.
One possible plot twist could be that Dabi forgets his hatred for his family. This would completely change his dynamic with his father, Endeavor. Instead of seeking revenge, he might start to question the reasons behind his former animosity. Maybe he'll even try to reconcile with his family members, which would shock everyone around him, especially those in the League of Villains who were counting on his vendetta to fuel their plans.
One possible plot twist could be that they suddenly discover a long - lost family secret that threatens their marriage. For example, it could be revealed that their families have an ancient feud that was forgotten over time. Another twist might be that a new character arrives, someone from Ranma's past who claims to be his betrothed from a prior arrangement. This would create a lot of drama as Ranma and Akane would have to deal with this unexpected situation. Also, there could be a magical or supernatural element involved. Maybe a curse is placed on their marriage that makes them forget why they fell in love in the first place, and they have to go on a journey to rediscover their feelings.
One plot idea could be that Hiccup forgets all about his dragon - training skills and his relationship with Toothless. So, he has to start from scratch, relearning how to communicate with Toothless. This would create a lot of humorous and touching moments as Toothless tries to remind Hiccup of their bond.
Another plot could involve them having to deal with family drama before the wedding. Maybe Ranma's father has some outlandish requests or Akane's family has some concerns. But through it all, their love for each other prevails and they finally tie the knot in a beautiful ceremony by a cherry blossom tree.
One interesting plot twist could be that Naruto is brainwashed into believing his friends are his enemies. So he starts to attack them, but then there are hidden memories that start to resurface during a crucial battle, making him question the brainwashing. This creates a moment of internal struggle within Naruto, which is a great source of drama.
One interesting plot twist could be that when Gajeel is revived, he has some new and unexpected magical powers. Maybe he can now control a different type of magic that was previously unknown to him and his allies. This new power could put him in a unique position within the story's power dynamics.
One interesting plot twist could be that when Ichigo is revived, he comes back with new and unexpected powers. For example, he might have the ability to control time on a small scale, which he uses to outwit his enemies in battle. Another plot twist could be that his revival is part of a larger, more sinister plan by an unknown force. This force might be using Ichigo as a pawn to achieve their own goals, and Ichigo has to figure out what's really going on while dealing with his new life. A third plot twist could be that Ichigo's revival brings back memories from a past life that he didn't know he had, and these memories hold the key to defeating a powerful enemy that has emerged while he was 'dead'.
One interesting plot twist could be that the kidnappers are actually being controlled by an old enemy of the Hidden Leaf Village who has a personal vendetta against Naruto. Maybe they plan to use him as a bait to draw out the Hokage. Another twist could be that Naruto is kidnapped by someone he trusts, like a seemingly friendly ninja from another village who has a secret agenda.
A really interesting plot twist could be that Merlin's stabbing is a pre - ordained event. It was foreseen by some ancient prophecy. But instead of it being his end, it is the trigger for a new and powerful form of magic to awaken within him. This new magic could be the key to saving Camelot from an even greater threat that was approaching unnoticed.
Well, in some Bella has amnesia fanfictions, a plot twist might be that her amnesia is a result of a spell gone wrong by a witch in the Twilight universe. This could lead to her having strange powers or abilities that she didn't have before. Also, it could be that her amnesia causes her to forget not only her personal memories but also all knowledge of the vampire and werewolf existence. So when she starts to regain her memories, it's a whole new discovery for her again.