Other important characters could be the enemies they faced during that era. For instance, the ninjas from other villages they fought against in the wars. These enemies could help showcase the Sannin's combat abilities and strategic thinking. Also, some of their comrades from Konoha, like Kakashi's father Sakumo Hatake, could be included to add more depth to the story.
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.
Definitely Hiruzen. He was not only their teacher but also the Hokage at the time. His interactions with the Sannin, whether it was giving them advice or reprimanding them, were crucial. Then there's Dan. His death had a profound impact on Tsunade. In addition, characters like Shikaku Nara or Inoichi Yamanaka could be interesting to include. They were important members of the Leaf village and could have had some interactions with the Sannin, even if they were not as prominent at that time. It would give a more complete picture of the village's ninja population during that era.
The 'naruto legendary sannin fanfic' can be a great way to experience the Naruto world from a different perspective. It may introduce new characters that interact with the Sannin, which could add more layers to the story. The fanfic might also explore the emotional aspects of the Sannin, like Tsunade's struggle with her past losses, Orochimaru's quest for power and immortality from a more psychological angle, and Jiraiya's hope for a better future for the ninja world through his relationship with Naruto.
It could be Jiraiya. He has a really strong bond with Naruto already. He's taught Naruto a lot in the original story too. So in the fanfic, his training could be the most in - depth, covering things like advanced rasengan variations and how to fight against really powerful enemies. His influence on Naruto's character development would also be significant.
Jiraiya would be the most interesting. He has a wild and carefree personality which could be a great contrast to Naruto's initially lonely and neglected state. Jiraiya is also very knowledgeable about the outside world and has many powerful jutsus, especially those related to the toads. He could take Naruto on adventures, teaching him not just about being a ninja but also about life in general. His connection to the prophecy about the 'Child of Prophecy' could also add an interesting layer to the story, as Naruto might be groomed in a different way to fulfill that prophecy under Jiraiya's guidance.
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.
One possibility is that Naruto with his Rinnegan powers could disrupt the power balance in the Sannin era. His modern jutsu and knowledge might give him an edge. For example, he could use his Rasengan in ways that the shinobi of that time have never seen. He might also form unexpected alliances, like befriending Orochimaru before he goes bad, which could change the entire future of the Naruto world.
It's hard to say for sure without reading it, but likely there will be three main characters who are the new sannin. They could be students of the original sannin or completely new characters with no direct connection but similar in their skills and importance.
The unique personalities of the Sannin make the 'naruto legendary sannin fanfic' interesting. Jiraiya is the carefree yet wise teacher, Orochimaru is the power - hungry and mysterious villain - like figure, and Tsunade is the strong - willed and sometimes stubborn medic - ninja. Their interactions are always full of drama and tension.