Going back in time gives Severus the opportunity to develop a different relationship with power. In the original timeline, his pursuit of power through the Dark Arts and association with Voldemort led to many problems. But if he goes back, he could use his knowledge to gain power in a more positive way. He could become a powerful force for good in the wizarding world, using his intelligence and skills to promote peace and cooperation. His character would then be seen as a reformed and wiser version of himself, rather than the conflicted and often tragic figure he was in the original story.
His character may become more cautious. Since he already knows the consequences of his previous actions, he'll be more careful in his decision - making. For example, he might not be as quick to trust Peter Pettigrew again. He could also develop a greater sense of responsibility towards his friends and the wizarding world as a whole, having seen the destruction that Voldemort caused.
In this fanfic scenario, Anakin's character would develop with a greater sense of purpose. He would no longer be a victim of fate. He could take control of his destiny. He would be more self - assured, knowing what lies ahead. His relationships with other characters would also be different. He would be more of a leader, guiding others based on his future knowledge. This would transform him into a more positive and influential figure in the Star Wars universe.
In a time - travel fanfic, Issei's character can develop a greater sense of responsibility. He realizes the consequences of his actions in the future and wants to make sure that the past is set on a better path. He might start taking on more leadership roles, guiding other characters towards a different future. He also becomes more empathetic as he sees the struggles of characters from a new perspective, understanding how his past actions affected them. This new - found empathy changes how he interacts with everyone in the DxD world, leading to a more mature and well - rounded character.
Snape's character development could take a very different turn. He may start to value life more, not just Harry's but also those around him. In the original, his focus was mainly on his own pain and his loyalty to Dumbledore. But going back in time, he realizes that every action he takes can have a huge impact on the future. This could lead to him becoming a more empathetic character. He might also become more of a hero in the eyes of others, which is a big change from his somewhat villainous reputation in the original story. He could start to see himself in a new light and strive to be a better person not just for Harry's sake but for the sake of the entire wizarding world.
She might become more confident in her earlier years. In the original story, Arya faced many hardships that made her grow in a certain way. But if she goes back in time, having the knowledge of future events, she could be bolder in her actions and decisions from a young age. For example, she might be more assertive in dealing with Sansa when they were kids, and not let Sansa's girly ways get to her as much.
Snape's relationships change. His interactions with Harry Potter could be completely different. Instead of the constant animosity, he might see Harry as a young boy in need of guidance, like he once was. He could become a mentor figure to Harry, which would rewrite a large part of the original story's dynamic.
Fem Harry might develop more empathy going back in time. In the original timeline, she faced a lot of hardships which made her a bit more guarded. But going back, she might use her experiences to be more understanding towards others. For example, she could be more patient with Neville, helping him gain confidence earlier. Also, she might be more confident in her femininity compared to her previous self, using it as a strength rather than something to be overlooked in the male - dominated wizarding world.
If Levi travels back in time, his character could develop more compassion earlier. In the original timeline, he had to go through a lot of hardships to become more empathetic towards his comrades. But if he goes back, knowing what he knows now, he might start showing more care from the beginning. For example, he could be more patient with new recruits instead of his usual tough - love approach.
Naruto's relationships would be different. He might be more of a mentor figure to his younger self or his friends. Since he has the power of the Juubi, he could offer a different kind of protection and guidance. He could also have a different view on his enemies, as he might be more inclined to try to change them rather than just defeat them, using the Juubi's power as a tool for persuasion.
Sansa would be more assertive in her political moves. She has seen the consequences of inaction and bad decisions in the future. So, she would be quicker to make decisions that benefit her family and herself. For example, she might be more involved in military strategies to protect the North.