It could also be related to a prophecy or a pre - determined fate in the fanfic's plot. There might be some kind of dark prophecy that says Kawaki has to kill Naruto to prevent a greater evil. Or perhaps Kawaki is being controlled by an external force that has a vendetta against Naruto and uses Kawaki as a tool to carry out the murder.
Kawaki makes his appearance in Boruto manga at a specific point, but I can't recall exactly. You might want to check the official manga sources for the precise chapter.
In this kind of fanfiction, Naruto might teach Kawaki about the values of the Hidden Leaf Village. Maybe he'd show Kawaki how to control his powers better. For example, Naruto could take Kawaki on training sessions similar to the ones he had with Jiraiya.
There's also a chance she meets her own ancestors. This would be a very emotional and educational encounter for her. She could learn about her family's past in a more direct way and maybe discover some long - lost family secrets.
Sarada's relationships would change. If she meets her ancestors or younger versions of people she knows, she'd have to navigate new dynamics. For example, if she meets a young Sakura, she might initially be in awe but then realize that her mother was also a normal ninja once. This would make her respect Sakura even more and also change how she views herself as part of their family legacy.
Naruto's influence would likely make Sarada more determined. His never - give - up attitude is infectious. So, Sarada might face challenges with more tenacity.
Sarada's character might develop a greater sense of empathy. When she travels back in time, she sees the struggles and hardships of the past. For instance, if she goes back to a time when the village was recovering from a great war, she would understand the sacrifices made by previous generations. This newfound understanding could make her more empathetic towards others in her own time as well. Also, she could become more confident in her abilities as she has to adapt to a different environment and challenges during her time - travel journey.