Boruto might become more mature. Through time travel, he could see the hardships his father and the previous generation faced. This would make him appreciate his current life more and also strive to be a better ninja. He might learn new jutsu from the past or future and add them to his arsenal.
Boruto might develop a greater sense of responsibility. In a time - travel scenario, he would be faced with situations where his actions have far - reaching consequences. For example, if he's in a past battle, he has to think carefully about his moves to avoid changing the future too drastically. This would make him more mature.
Sarada might develop a greater sense of self - reliance. When she travels through time, she may be on her own without the support she has in her own time. This would force her to trust her instincts more and become more independent.
Sarada's character often develops a greater sense of self - awareness during time travel. In the past, she may see how her family and the village were shaped, which gives her a new perspective on her own life. For example, if she sees her mother, Sakura, as a young and determined kunoichi, it might inspire her to be more like that. Also, she may become more resourceful as she has to adapt to the different ways of the past. She can't rely on the modern technology or some of the ninja tools she is used to in her own time.
Their relationship in fanfiction could develop gradually. At first, they might be a bit awkward as a married couple. But as they spend more time together, they'd understand each other better. Boruto would learn to respect Sarada's intelligence and Sarada would come to appreciate Boruto's spontaneity.
If Boruto uses his rasengan in the past or future, it could have unforeseen consequences. It might be a new jutsu in that time period and could cause shockwaves through the ninja world. Sarada's chakra control, which is enhanced by her sharingan, could help her adapt more quickly to the different chakra levels in the time - travel destination. For example, if they go to a time with weaker chakra, she could still perform her jutsus effectively while Boruto might have to adjust his power output more.
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.
She would likely become more confident. Facing a legend like Madara would force her to grow. She might also become more strategic as she learns from Madara's battle - tested strategies.
Sarada would probably be in awe. She's always been interested in the history of the village. She'd be excited to see the First Hokage in action and learn about the early days of the Hidden Leaf. But she'd also be a bit out of place, with her modern - day ninja skills and knowledge.
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.
For Boruto, time traveling might make him more appreciative of the past and how hard his father worked to build the world he lives in. He could become more humble and learn from the simplicity and determination of the past generations. His friends, too, might gain a new perspective on their own lives. For example, Sarada could see how her mother was as a young kunoichi and understand her better.