If she goes back in time, her relationship with the Jedi Council would change. Since she has more knowledge of the future, she could prove to them that some of their decisions were wrong. This might make them respect her more, or it could lead to her being seen as a threat. As for her relationships with her clone trooper friends, she could use her knowledge to keep more of them alive during battles, which would strengthen their bond even more.
She could change many important events. Maybe she would prevent some tragedies from happening in the Star Wars universe. For example, she might be able to save some Jedi who were killed during Order 66.
His relationship with his father would be completely different. Instead of growing up without him, he could have a normal father - son relationship. His father could teach him ninjutsu from an early age.
In the 'Gundam Seed' fanfiction where Kira goes back in time, his relationships would change significantly. He would have the opportunity to approach his friends and allies in a new way. He could avoid misunderstandings that happened before. Also, he might be able to form new relationships with characters he didn't interact much with in the original story.
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.
If Kakashi goes back in time, his relationship with Rin would be complex. He might try to protect her more, which could lead to a different dynamic between them. He would be more aware of the threats she faces and could be more proactive in her safety. With Guy, he could be a better friend from the start. He could join Guy in his challenges and competitions more often, strengthening their rivalry - friendship. And when it comes to the Third Hokage, Kakashi could offer more insights based on his future knowledge. This might make the Third Hokage rely on him more, and Kakashi could become a more important figure in the village at an earlier stage.
If Naruto and the Bijuu go back in time, Naruto's relationship with Madara could be completely transformed. Instead of being enemies in the future timeline, Naruto could try to understand Madara's motives from the start and perhaps prevent him from going down the dark path. The Bijuu, on the other hand, might have a different relationship with the Uchiha clan in general. They could offer their power to the Uchiha in a more positive way, rather than being something the Uchiha might try to control in the future.
His relationship with his father, Ned Stark, would be different. He could finally have a real father - son relationship instead of the hidden one. He might be able to learn from Ned and become an even better leader in the North.
His relationship with Katara would be very different. He might be able to approach her in a more confident way, knowing what they've been through in the future. He could also avoid some of the misunderstandings that happened between them in the original timeline.
With his Slytherin peers, Draco's relationship would shift. He might encourage them to be more inclusive and less focused on pure - blood supremacy. This could make him an outcast among some of the more traditional Slytherins, but also gain him new allies who are open to change.
His relationship with Kakashi would also change. Naruto could use his Rinnegan - enhanced knowledge to help Kakashi deal with his past traumas earlier. He might also show Kakashi new jutsu or ways of combat that he learned in the future. This would make Kakashi see Naruto in a whole new light and their bond could become more of a teacher - student relationship in reverse.