His relationship with Odin could change significantly. Thor might see Odin in a new light, especially if he goes back to a time when Odin was a younger and more impulsive king. He could also learn things about Odin that he never knew before, which would either strengthen or strain their relationship. And when it comes to Jane Foster, if he goes back far enough, he could meet her in a different context, perhaps before she was involved in the scientific research that brought them together in the original timeline.
Thor's relationship with Heimdall would be an interesting one to explore. Going back in time, Thor might rely on Heimdall even more than he did in the future. Heimdall, with his all - seeing abilities, could be a key figure in Thor's time - traveling adventures. Also, Thor's interactions with the Asgardian people as a whole would change. He could be more involved in their daily lives in the past, and this could lead to a stronger bond between him and the common folk of Asgard, which would be different from his more regal and distant relationship with them in the future.
If Thor goes back in time, his relationship with Loki would be very different. In the past, Loki might not be as bitter and jealous as he becomes in the future. Thor could try to be a better brother and prevent Loki from feeling left out, which would change their entire dynamic. With his friends like the Warriors Three, he might be more protective of them in the past, knowing the challenges they will face in the future.
For Naruto and Juubi going back in time in the fanfiction, their relationship with the village elders would be quite altered. The elders might be more cautious or even fearful of Naruto due to his association with Juubi. Meanwhile, Naruto's friends like Shikamaru might be both amazed and a bit worried. Amazed at the new power Naruto has and worried about the potential chaos it could bring. And Naruto could use Juubi's power to protect his friends more effectively from the start, strengthening their bonds.
When they go back in time, they may encounter situations where they have to protect each other. This could be a big turning point in their relationship. Let's say they go back to a time when there were dark wizards targeting their families. They would have to put aside their differences and fight side by side. This could lead to a complete transformation of their relationship. Draco might realize that Harry is not his enemy and Harry could see that Draco is capable of loyalty and self - sacrifice. It would be a very different dynamic from their relationship in the original timeline.
If Killua goes back in time, his relationship with Gon could become stronger. He might use his knowledge of their future together to avoid any misunderstandings that happened before. For example, he could be more open about his feelings and fears earlier, which would deepen their bond.
One interesting plot twist could be that Thor goes back in time and accidentally changes something that makes him lose his powers. For example, he might prevent the event that led to him getting Mjolnir, and then has to find a new way to be a hero without his trusty hammer. Another could be that he goes back and meets a younger version of Loki who doesn't yet hate him, and he has to figure out how to keep it that way so that their relationship in the future is different.
Anakin's time travel could lead to a completely different relationship with Padmé. He may realize that his obsession with her in the original timeline was part of what led him down the dark path. So, instead of repeating the same pattern, he could focus on being her friend and protector in a more platonic way. This new dynamic might not only change their relationship but also have a significant impact on Anakin's overall character development and his place in the galaxy.
If Ron goes back in time, he might have a chance to see Hermione in a new light. Maybe he realizes her importance earlier and becomes more protective of her from the start. This could lead to a more mature and deeper relationship developing faster than in the original timeline.
Since Naruto has more knowledge of the future, Kakashi might start to rely on him more, which could shift their relationship. Naruto could also see a different side of Kakashi from the past, and this new understanding could deepen their connection. For example, they might have to face some challenges together that make them trust each other more than 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.
Well, for Naruto and Sasuke, their relationship might become even stronger earlier. In the past, they could train together more and understand each other's pain from the start. Sakura might be more assertive in her relationship with Sasuke, as she has the knowledge of what will happen in the future. She could try to prevent Sasuke from going down a dark path right from the beginning. And among the other members of Konoha 12, they might form closer bonds as they rely on each other more in this strange new situation of being in the past.
The storyline would change significantly. Firstly, Lelouch would have the upper hand in terms of knowledge. He'd know who to trust and who not to trust right away. This would change the power dynamics in his relationships. For instance, he could expose the true nature of some of the Britannian nobles much earlier.