Another plot could be that Tobirama is somehow resurrected in Naruto's time. He then becomes a mentor to Naruto, sharing his knowledge of water - based jutsu and strategic thinking. Tobirama could also be amazed by the current state of the ninja world and how far it has come, while also providing his own insights on how to make it even better.
One idea could be Naruto time - travels back to Tobirama's era. He could use his modern - day knowledge and jutsu to help Tobirama in some great battles. Maybe Naruto teaches Tobirama about the concept of true friendship among different clans, which could change Tobirama's views on some policies he had for the clans.
A really interesting plot could be that Tobirama is reborn as a non - ninja, but still has his chakra control abilities. He has to find a way to use his skills secretly while living a normal life at first. As he discovers more about the world he's in, he starts to influence the ninja world from the outside, creating a whole new dynamic in the story.
One idea could be Tobirama traveling to the future and seeing how his village has developed. He might be shocked by the new technology and the different ninja techniques. Another plot could involve Tobirama going back in time to change a crucial event in Naruto's past, like preventing the Uchiha massacre. Or perhaps he travels to a different timeline altogether and has to find a way back while dealing with that timeline's unique challenges.
One interesting plot idea could be exploring their early days before the founding of the village. Maybe a story about a dangerous mission they went on together that strengthened their bond. For example, they could be facing a powerful enemy that forces them to rely on each other's unique skills. Tobirama's strategic mind and Hashirama's raw power could combine in unexpected ways to defeat the foe.
Well, in a Naruto x Tobirama time travel fanfiction, it could be that Naruto is sent back in time to right before Tobirama's death. Naruto, being Naruto, tries to save Tobirama. Tobirama is initially suspicious of Naruto but then realizes his good intentions. Together, they work on a plan to make the ninja world a better place even before Hashirama's time. They could come up with new ways of training ninjas, ways that are more inclusive and less likely to lead to clan rivalries. This would then change the course of the entire Naruto universe.
One interesting plot idea could be a time - travel scenario where Sakura is somehow sent back in time to the era of Tobirama. She could use her modern medical knowledge to help in his village, and in the process, they start to develop feelings for each other. Another idea is that Tobirama is resurrected in the modern era where Sakura lives. He has to adapt to the new world, and Sakura helps him. During this, a relationship blossoms.
Maybe Tobirama discovers Sakura's chakra control abilities and decides to study her in order to improve his own understanding of chakra. This leads to a series of experiments and training sessions together, during which they develop a mutual respect for each other's skills and determination.
One idea could be that the OC has Tobirama's memories slowly resurfacing. As they do, the OC starts to show extraordinary skills in water jutsu, just like Tobirama was known for. Another plot could involve the OC being drawn to the Senju clan's old haunts and trying to piece together Tobirama's past, which leads to uncovering long - lost secrets of the clan.
One plot idea could be Tobirama's early days as a ninja. Explore his training, his relationship with his brother Hashirama, and how he developed his unique jutsu. Another could be a time - travel story where a modern - day Naruto character gets sent back in time and has to interact with Tobirama. Or perhaps a story where Tobirama has to deal with a powerful new enemy that challenges his beliefs and leadership.
Perhaps in this fanfiction, there's a secret prophecy about Naruto being the grandson of Madara and Tobirama. This leads to a lot of political intrigue within the village. Some people want to use Naruto for their own gain, while others are afraid of what his true heritage might mean for the future of the Hidden Leaf.
A plot idea could be that Naruto discovers a new, ancient form of chakra that has been lost for centuries. He then has to train to master this chakra while also dealing with the political implications within the Hidden Leaf Village. Some elders might be against him exploring this new power for fear of the unknown, but Naruto, being Naruto, is determined to master it for the good of the village.