Yes, in some fanfictions Naruto is depicted as the Rikudo Sennin. Fanfiction writers often like to create alternate storylines where characters take on different roles or powers, and this is one such example.
One implication is the change in power level. Naruto as the Rikudo Sennin would be extremely powerful, which could lead to different battle outcomes. For example, he could easily defeat enemies that were previously tough for him.
One great 'Naruto Rikudou Sennin Fanfic' is 'The Sage's Legacy'. It delves deep into the backstory of Rikudou Sennin and how his powers could have been passed down in different ways than what was shown in the original Naruto series. The character development in this fanfic is really well - done.
Another main character could be Kakashi. As Naruto's teacher, he might be involved in the story when the Kitsune Sennin starts to train Naruto. He could be skeptical at first but then come to understand the importance of the Kitsune Sennin's teachings. Also, his own experiences and knowledge could interact with what the Kitsune Sennin brings to the table, adding more depth to the story.
One interesting Naruto Kitsune Sennin fanfic could be one where the Kitsune Sennin imparts unique and ancient jutsu to Naruto. Maybe a jutsu that combines the power of the fox spirit with his own chakra nature in a new way.
The 'naruto heir of the rikudo sennin fanfiction' might be centered around Naruto's growth as the heir. It could include things like Naruto learning the secrets of the Rikudo Sennin, perhaps unlocking some hidden jutsu or knowledge. There could be a focus on the political implications as well, like how different ninja villages react to Naruto being the heir. And it may also involve Naruto's struggle to balance his newfound responsibilities with his own goals and values.
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.
They often make him seem irresponsible. For example, in normal Naruto story, Jiraiya is seen as a mentor to Naruto. But in bashing fanfiction, he may be shown as being more interested in his own adventures and leaving Naruto alone at crucial times.
It could be Orochimaru. Since Orochimaru has a long - standing feud with Jiraiya and is always up to no good. If Naruto ditches Jiraiya, Orochimaru might see this as an opportunity to manipulate Naruto. He could try to convince Naruto that Jiraiya was holding him back and that he can offer Naruto more power, all while having his own evil plans for Naruto.