In this fanfiction, perhaps Jiraiya goes back in time to prevent certain tragedies. He might try to stop the deaths of his friends or change the course of events that led to the downfall of the Hidden Leaf Village at some point. He could use his knowledge of future events and his powerful jutsu to rewrite history.
Maybe the main antagonist could be an older version of Madara Uchiha who has somehow found a way to manipulate time as well. He might be trying to change the past in a way that benefits him and his grand plan for the ninja world, which would put him in direct conflict with Jiraiya.
Well, when Naruto and Jiraiya's jutsu goes wrong, it could lead to a disruption in the space - time continuum within the fanfiction world. Jiraiya might be sent to a different dimension while Naruto is left behind, and they have to find a way to reunite. This could involve Naruto having to learn new jutsu to open a portal to the dimension Jiraiya is trapped in. It would be a long and arduous journey for Naruto, full of self - discovery and growth as he tries to save his mentor.
In a Young Justice fanfiction, Naruto's Sage Mode could change the power dynamics significantly. His Sage Mode gives him access to nature energy, which could interact in strange ways with the various powers and technologies in the Young Justice world. For example, his ability to blend into nature while in Sage Mode might make him an excellent spy or infiltrator. Plus, his battle experience and strategic thinking from the Naruto world could help the Young Justice team in their missions.
A cool fanfic could center around Naruto teaching his friends about the unique abilities he gains from Sage Mode and Matatabi. For example, he could show how the Matatabi's chakra enhances his Sage Mode perception, allowing him to sense even the faintest of threats from a much greater distance. This could lead to new team strategies during battles against the Akatsuki.
Drawing Naruto Sage Mode's Manga Rasengan accurately can be challenging. You need to understand the energy flow, the shape, and the shading. But with practice and reference to the manga, you can get close.
The story could develop with Naruto and Jiraiya having to face the consequences of their failed jutsu. Maybe they are shunned by the village at first because of the danger they pose.
Jiraiya might comfort Naruto by sharing his own experiences. He could tell Naruto about the times he faced difficulties and how he overcame them. For example, he might talk about his training with the toads and how he grew stronger through perseverance.
One possible reason could be that Naruto feels he has learned all he can from Jiraiya at that point. Maybe he wants to explore his own path independently and test his skills without Jiraiya's constant guidance.
Jiraiya's reaction might be complex. He might be in awe of Naruto's new power but also sad about his departure. He could see it as a natural progression in Naruto's journey, yet still feel a pang of loneliness. He might start to reflect on his own life and training methods, wondering if he could have done something differently to keep Naruto with him. At the same time, he would be eager to see what Naruto will achieve in the world with his newfound abilities.