He would probably develop a greater sense of purpose. Since he has the chance to change things, he'd be more focused on making a positive impact. For instance, he could use his knowledge to train younger wizards better, which would in turn shape his character as a mentor figure.
His character would likely become more mature. Seeing the past and knowing the future would make him more responsible. He might not be as reckless as he was before.
His character could develop a sense of urgency. Knowing that he died in his original timeline, he would want to make the most of his second chance. He might become more of a leader, taking charge in situations where he previously would have held back. He could also become more empathetic, as he has seen the consequences of his actions in the past life.
He could become a more benevolent figure. Knowing the destruction the Sith can cause, he may focus more on spreading the light side of the Force. He might use his past experiences to teach younger Jedi about the dangers of the dark side in a more effective way than was done in the original timeline. This could lead to a stronger and more united Jedi Order in the long run.
If Anakin is sent back in time, he might become more cautious. Knowing what his future holds, he would be careful not to repeat the same mistakes. His character could develop into a more patient and wiser version of himself. He might also become more empathetic as he has a second chance to understand the consequences of his actions on others.
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.
Another possibility is that his time - traveling could create some sort of time paradox. This might lead to all sorts of strange and unexpected consequences. His presence in the past could disrupt the normal flow of magic and time, and he'd have to find a way to fix it before everything goes wrong.
Naruto's character would likely become more mature. Since he has the memories of his future self, he would understand the consequences of his actions better. He would not be as impulsive when dealing with situations like fighting with Sasuke or facing the Akatsuki. Also, he would probably be more strategic in his approach to training and battles. Instead of just jumping into things head - first, he would plan and think ahead, making him a more well - rounded and respected ninja among his peers at a much earlier stage.
He'd be more confident. In his original Genin days, he was a bit of an underdog, but with his future memories, he'd know his potential. So he'd act more boldly.
His sense of purpose might also change. In his original time, he might have been fighting for a certain cause. But in the past, he could discover new things to fight for or new values to uphold. Maybe he realizes the importance of preserving certain aspects of the past that were lost in his future, and this changes his overall attitude and personality as he becomes more of a preserver than a fighter in some ways.
His water - based powers might be affected in different ways. If he goes back to a time when the oceans were less polluted, the purity of the water could make his powers stronger. However, if he goes to a time when the gods were more in control of the elements, they might be able to limit his power. For example, Poseidon might have more say over how Percy can use water powers if they are in the same time period.
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.