Well, one possible plot could be that on May Day, something magical or scientific happens that sends Peter back in time. He might end up meeting a younger MJ. Maybe he tries to change certain events in their past to make their relationship better in the future. For example, he could prevent some misunderstandings that happened between them before.
In this fanfiction, perhaps on May Day, Peter goes back in time due to an experiment gone wrong. He finds himself in a time when MJ was still in high school. He has to navigate the past without changing too much, but still wants to get closer to MJ. He could end up joining some of the school activities she was in, like the school play. This would give him a chance to bond with her in a new way, and also give him insights into her character that he didn't have before.
Well, in the past, their relationship could take a completely different turn. Peter, with his future knowledge, might be able to avoid some of the awkward moments that happened between them before. He could be more charming and understanding. This might make MJ fall for him more quickly. Also, he could use his powers in a more discreet way to impress her, like saving her from a small accident in a very cool way that doesn't give away his identity completely. This would make their relationship more exciting and passionate in the past compared to what it was originally.
Peter might go back in time to meet the original Spider - Man from the comics in that era. He could learn some old - school techniques and wisdom from the early version of himself. This encounter could also give him new ideas on how to fight his enemies in the present. He might bring back some forgotten lore or gadgets that could be useful in his modern - day battles.
One possible plot could be that Kagome goes back in time and tries to change a major event in the past. For example, she might try to prevent a big battle that had a lot of casualties. She could use her modern knowledge and skills to her advantage in the past, like using first - aid knowledge to save lives.
Well, one possibility could be that Kurama goes back to a time when he was first captured by the shinobi. He might try to change things so that he doesn't end up in their hands initially. He could use his knowledge of the future to outwit his captors and escape much earlier, and perhaps even start a new life in a different part of the world.
Well, in the fanfiction, Itachi could go back in time and decide to train his younger self more rigorously. This would not only make him stronger but also change the way he approaches his future tasks. He might also try to influence Sasuke at an earlier age, guiding him in a different direction than in the original timeline. And he could befriend some characters earlier to build a stronger support network for the Uchiha clan.
Maybe Yusei goes back in time to prevent a great disaster that happened in the past. He could use his knowledge from the future to change certain events and save lives.
In a 'kaneki goes back in time fanfiction', perhaps Kaneki goes back to when he was still a normal college student. He then decides to study more about ghouls secretly. He could use this knowledge to try and find a way to co - exist peacefully between ghouls and humans from the very start. He might start by trying to change the views of some key people in the CCG, using his understanding of their future actions.
Well, one possible plot could be that Zuko goes back in time and tries to prevent the Fire Nation's aggression from the start. He could use his knowledge of the future to change things for the better, like trying to influence his father in a different way to avoid the war.
One possible plot could be Serena going back in time to prevent a major disaster in her world. For example, she might go back to stop an evil force from being released. In the past, she could meet younger versions of her friends and family, and they might not recognize her at first. She would have to use her knowledge from the future to try and change things for the better.
Perhaps Elsa goes back in time to meet her parents again. She could learn more about her powers from them, as they might have known more than she initially thought. This encounter could also give her a chance to say goodbye properly, which she didn't get the first time. And it could lead to her having a better understanding of her place in the kingdom and her family.