A great plot for 'naruto sannin era fanfiction' would be to show how the Sannin's different ideologies started to form. Orochimaru's thirst for power might have begun with a particular event or discovery during this era. Tsunade could be shown dealing with the loss of her loved ones and how that shaped her views on life and the ninja world. Jiraiya's idea of finding the 'Child of Prophecy' might have been seeded during his experiences in the Sannin era as well.
You could have a plot where the Sannin are pitted against a mysterious and extremely powerful opponent that forces them to work together in ways they haven't before. This opponent could be from a far - off land or be a product of some dark ninja experiment. It could also be interesting to explore how the Sannin's reputations were built during this era. Maybe there were some smaller battles or feats of skill that were overshadowed by their later, more well - known deeds but were crucial in making them the legends they became.
A different plot might be about the Sannin's individual dreams and how they started to diverge. Tsunade's desire to heal and protect, Jiraiya's aspiration to write a great novel and find the child of prophecy, and Orochimaru's thirst for power and knowledge. You could show the events that led to these different paths and how they affected their relationships.
One idea could be that the puppet sannin create a super - powerful puppet that requires the combined skills of Naruto and his friends to defeat. Maybe this puppet has the ability to absorb chakra and uses it to grow stronger.
Well, a really interesting plot could be that the Sannin were actually working together secretly to protect Naruto all along. They knew something about his birth that made him a target. So, Naruto grows up thinking he's just an orphan with no real connection to them, but as the story unfolds, he discovers the truth. He then has to learn how to use the combined knowledge and powers of the Sannin to face a new and powerful enemy that has been after him since his birth. This would add a whole new layer of mystery and power - up to Naruto's character.
One idea could be exploring how the fourth sannin, if there was such a concept, might have influenced Naruto's training in a unique way. Maybe they had a special jutsu that they passed on to Naruto secretly.
One idea could be the new Sannin facing a powerful new enemy that threatens the entire ninja world. They have to combine their unique skills, like one being a master of genjutsu, another of taijutsu, and the last of ninjutsu, to overcome it.
One plot idea could be that the Sannin discover a prophecy that only Naruto, Sasuke, and Sakura can fulfill. So they take the three under their wings more intensively. Jiraiya focuses on Naruto's spiritual growth, Orochimaru on Sasuke's control over his dark powers, and Tsunade on Sakura's physical and mental strength. As they train, they also uncover secrets about the ninja world that could change everything.
A third idea is to create a story centered on the role of women in the Warring States Era of Naruto. Women were often overlooked in the original series, but in a fanfiction, we could explore how female ninjas in different clans contributed to the war effort, whether it be through espionage, combat, or strategic planning.
A great plot idea could be to explore the role of the Hyuga clan in the clan wars era. Maybe there was a power struggle within the clan regarding their stance in the wars. Or, you could write about a forbidden love story between a member of the Uchiha clan and a member of an opposing clan during this time. This would add a lot of drama and conflict to the fanfiction.
One interesting plot twist could be that the Sannin travel back to a time when Orochimaru was still a good - hearted ninja. They could try to prevent his fall to the dark side. This would change the entire future of the Naruto world as Orochimaru's actions had a huge impact on many events.
One interesting 'naruto sannin fanfiction' story could be about the sannin's early days together. It might explore how Orochimaru, Jiraiya, and Tsunade first became a team and the adventures they had before they went their separate ways. Another could be a story where the sannin are reunited in a different dimension and have to work together to get back to their own world.