Maybe Hashirama's ghost is bound to a certain location, like the old Senju compound. Naruto discovers this place accidentally and starts seeing visions of Hashirama. The ghost then guides Naruto through a series of trials that test his resolve and leadership skills, just as Hashirama was tested in his time.
One idea could be that Hashirama's ghost appears to Naruto during a crucial battle. He imparts some long - forgotten jutsu or strategy that was unique to the Senju clan. This could give Naruto an edge in the fight and also help him understand more about the history of the village.
One idea could be a story where Madara and Hashirama are reborn in the modern ninja world and have to navigate the new technologies while still having their old grudges and loyalties. They might initially be confused but then slowly adapt and perhaps even find a way to resolve their age - old differences.
One idea could be a time - travel plot where Naruto gets sent back in time and meets Hashirama. They could team up to face a new, unknown threat that was secretly brewing during Hashirama's time. Another could be a story where Naruto inherits some of Hashirama's unique abilities through a special jutsu or curse and has to learn to control them.
One idea could be Naruto traveling back in time and meeting Hashirama. They could team up to face a new, powerful enemy that threatens the very foundation of the ninja world. Naruto's modern techniques combined with Hashirama's wood - style jutsu would make for some epic battles.
Maybe the son discovers an ancient scroll left by Hashirama that contains long - lost jutsu. This sets him on a journey to master these jutsu while also facing the challenges of those who want the scroll for their own malicious purposes. He could have to team up with Naruto and his friends to protect the scroll and the village.
One plot idea could be that Fem Naruto, with her unique charm and determination, teams up with Hashirama in a time - travel scenario. They go back to the founding days of the village to prevent a great disaster that was previously hidden in history. Another could be a story where Fem Naruto discovers she has a special connection to Hashirama's chakra, which leads to her unlocking new powers and having to deal with the responsibilities that come with it.
One idea could be a story where Naruto and Hashirama meet in a time - travel scenario. Naruto gets to learn directly from Hashirama about his wood - style jutsu and his vision for the village.
One idea could be Naruto traveling back in time and meeting Hashirama. He could learn about the founding of the village directly from Hashirama. Maybe Naruto helps Hashirama deal with some early threats to the village that were not well - documented in history.
One idea could be a time - travel plot where Naruto is sent back in time to the era of Hashirama and Madara. He could try to prevent their feud from escalating and change the course of ninja history. This would involve him using his modern - day knowledge and skills in a very different context.
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, perhaps Fem Hashirama is reincarnated in a way and she has no memory of her past. Naruto finds her and realizes who she is. He then takes it upon himself to help her regain her memories. Along the way, they go on various adventures, meet old friends and foes of Hashirama's time. Their relationship blossoms as they work towards the goal of restoring her memories and she also becomes a powerful ally to Naruto in his fight against the remaining threats in his world.