Another twist might be Naruto going back to the time when the Nine - Tails attacked Konoha. He could potentially find a way to stop the attack or at least lessen the destruction. Maybe he could even change how the village views the Nine - Tails and those who are jinchuriki. For example, instead of fearing and ostracizing them, they could start to understand and accept them earlier.
Well, one thing that could happen is that Naruto, with his knowledge of future events, could easily ace the written part of the Chunin Exams. He might also be able to prevent some of the chaos that Orochimaru caused during the exams. For example, he could warn the proctors about Orochimaru's infiltration in advance.
Hashirama's revival might also bring back old wisdom and knowledge. He could teach the new generation of shinobi things that have been lost over time. However, there could also be political issues. Some might not be happy with a long - dead Hokage coming back and potentially interfering in current affairs. And his revival could also have an impact on Naruto's own growth. With Hashirama around, Naruto might have to re - evaluate his role as a leader and a shinobi.
Naruto's positive attitude and his belief in friendship might make Hashirama more open - minded. For example, if Hashirama was hesitant about an alliance, Naruto could convince him with his own experiences of forming bonds across clans.
Well, Naruto would be more confident. Since he has the knowledge of the future, he knows what mistakes to avoid and how to handle situations better. For instance, he won't make the same naive mistakes when dealing with his enemies or friends.
One possible plot could be that Naruto travels back in time and meets Hashirama during the founding of Konoha. Naruto might be amazed by Hashirama's power and his vision for the village. He could learn from Hashirama about the original ideals of Konoha and bring those lessons back to his own time to make Konoha better.
In the time of Hashirama, Naruto would be quite an anomaly. He could introduce new concepts like the idea of different villages working together more amicably. Since Naruto has a way of befriending people, he might even befriend the young Uchiha clan members and prevent some of the future animosity between the Uchiha and Senju. And his chakra levels and control would surely impress Hashirama.
In some fanfictions, Naruto might use a powerful jutsu. Maybe he discovers an ancient sealing technique that can bring back the dead for a short time. He could also have found some rare chakra-infused artifact that has the power to revive the First Hokage.
One possibility could be Luffy changing key events to prevent the losses of his dear friends. This would add a lot of drama and emotional depth to the story.