Well, Naruto could go back in time and train his younger self. He'd be able to pass on all the skills and knowledge he has as the 6th Hokage. This would make his younger self much stronger and more confident much earlier in life.
Another idea for this fanfiction is that Naruto's time travel as the 6th Hokage could lead to him meeting his predecessors in a different way. He could learn new jutsu or leadership skills directly from them. For instance, he could have in - depth conversations with the 1st Hokage, Hashirama, about how to better manage the relationships between different ninja clans and build a stronger, more united village.
Well, if Naruto becomes the 5th Hokage in fanfiction, he would surely bring a new energy to the village. He might start by reforming the ninja training system. Since he had a tough time growing up as an outcast, he'd make sure no kid in the village ever feels that way. He could also focus on better relations with other villages. Naruto's always been about peace and friendship, so he'd probably organize more joint ninja missions with other villages to build trust.
They could go on adventures together. As the 6th Hokage, Naruto would have access to all kinds of resources and knowledge. Hinata, being his wife, could accompany him on some secret or important missions. For example, they might go to explore an ancient ninja ruin to find a powerful artifact that could help protect the village. Along the way, they would face various traps and enemies, and their love for each other would be tested.
Maybe Naruto travels back to his own childhood days. He could use his knowledge as Hokage to help his younger self become stronger faster. He might also be able to prevent some of the hardships he faced, like not having enough food sometimes. This would not only change his own life but also the relationships he had with people like Iruka - sensei, who took him under his wing when he was a lonely kid.
If Naruto travels back to the past, his relationship with his parents would be completely different. He would finally get to meet them as an adult and be able to have proper conversations with them. He could share his experiences and they could give him advice from their own wisdom.
His relationship with his parents would be very strange. If he goes back to a time when his parents were alive, he would have to hide his true identity. But he could also get to know them in a way he never did. He might be able to change their fates as well, which would have a huge impact on his own life and the entire Hidden Leaf Village.
In fanfiction, Naruto's rule as the 5th Hokage might be full of positive changes. He would probably focus on improving relationships between the different ninja clans in the village. He'd also likely invest a lot in training the new generation of ninjas, using his own experiences to teach them about perseverance and the importance of friendship.
Under Naruto as the 5th Hokage in fanfiction, the village would experience a cultural shift. Since Naruto values all kinds of people, the village would be more open to different ideas and ways of life. New forms of ninja techniques might be developed as he encourages everyone to explore their potential. Also, the village's defenses would be strengthened not just by physical means but also by the strong bonds between the villagers, which Naruto would foster.
Well, if Konoha 12 watches the future 7th Naruto in fanfiction, they would probably have mixed reactions. Some, like Shikamaru, might immediately start thinking about the implications of Naruto's future actions on the present. Others, like Kiba, might be more excited to see Naruto's new jutsu or how he has become even stronger. And Sakura might be emotional, seeing how Naruto achieved his dream and how much he has changed from the boy she once knew.
Naruto himself could be a likely candidate. Given his strength, leadership skills, and his dream of uniting the ninja world, he would make a great 6th Hokage.