His powers would likely shock the past characters. They might see him as a great hope or a potential threat. If he uses his powers openly, it could change the way the Z - fighters train and view their own power limits.
Future Gohan's powers could speed up the development of other characters. For example, if he sparred with young Goku, Goku might learn new techniques faster. His presence could also inspire the scientists in the Dragon Ball world, like Bulma, to develop new technology to counter or match his powers.
Well, Future Gohan's powers would have a huge impact on the past. Imagine him showing up during the Saiyan saga. His power level would be far beyond what the Z - fighters knew at that time. He could easily defeat Raditz, which would change the entire sequence of events. This would mean that characters like Vegeta and Nappa might not even come to Earth as they did in the original story. Also, his knowledge of future battles and techniques could be passed on, creating a completely different power dynamic among the characters.
Well, his powers would also attract a lot of attention. Scientists in the past might be intrigued by his abilities and try to study him. This could either lead to a better understanding of superhuman abilities in that timeline or it could create chaos as different groups try to capture him for their own purposes. His presence could also inspire others to strive for greater physical abilities.
If Gohan travels back in time, his relationship with his father, Goku, would be really interesting. He could train with Goku as an equal, which would be a different dynamic from their usual father - son - student - teacher relationship. Goku would probably be surprised but also excited to have such a strong partner to train with.
Their powers could actually be beneficial in some ways. Boruto's ability to think on his feet and use his various skills could help in solving some past problems. Himawari's Byakugan could be used for reconnaissance in dangerous situations in the past. But they must always remember that any use of their powers could have a butterfly effect. So they would need to be cautious and consult with each other before taking any major actions with their powers.
Naruto's power of the Nine - Tails would be a major factor. In the past, the Nine - Tails was feared and hunted. If Naruto shows up with the power under control, it could change how people view the beast. His chakra reserves, which are huge because of the Nine - Tails, could allow him to perform feats that were previously thought impossible in the past, like quickly rebuilding a village or fending off a large - scale invasion on his own.
His super strength could easily disrupt the past. For example, if he's not careful while trying to stop a crime, he might accidentally cause more damage than good. He could break things that were important in the original timeline.
His powers might also influence the people in the past in unexpected ways. Maybe his dark chakra could seep into some characters and start to corrupt them earlier than in the original story. This could lead to new alliances and rivalries forming, completely different from what happened before. For instance, a character who was originally a hero could be turned into a villain because of Dark Naruto's influence.
His super strength could accidentally cause destruction in the past. For example, if he's not careful while saving someone, he might break a building that was historically important. His spider - sense could also give him an unfair advantage in situations where he shouldn't have such an edge, like in a simple street fight in the past.
His return could have a huge impact on the power balance. Since Future Gohan is a powerful fighter, his presence could tip the scales in battles against villains. For example, in fights against the Saiyans or the androids, his skills and experience could give the Z - fighters an edge.
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.
Their powers are quite strong. They could easily overpower many of the villains in the past. This might lead to a quick end to some threats that were difficult to deal with in the original timeline. For instance, if they faced Frieza in the past, they could defeat him without much trouble, changing the course of the Saiyan story.