Well, Tsunade could be a great helper. She has extensive knowledge of chakra control and medical ninjutsu. She could teach Naruto how to use his chakra more precisely when creating the Rasengan, perhaps by showing him some medical - ninjutsu - based chakra control techniques that can be applied. Minato, Naruto's father, could also play a role. He was the one who originally created the Rasengan. He could appear in Naruto's dreams or in some sort of time - travel scenario and show Naruto some hidden aspects of the Rasengan creation that he didn't know before. And then there's Sakura. She's become very strong over time. She could use her strength and knowledge to assist Naruto, maybe by creating some sort of training regimen for him to improve his Rasengan creation skills.
In a fanfiction, Iruka could be a surprising helper. He was Naruto's first teacher and has always believed in him. He might not be as powerful as some of the other characters, but he could offer moral support and some basic advice on chakra control that Naruto had forgotten. Another possibility is Kurama. Since Kurama is the source of Naruto's chakra, he could offer some unique perspectives on how to use that chakra more effectively for the Rasengan. He could show Naruto how to draw on his own chakra in a different way, perhaps a more instinctual way. And Rock Lee could also be involved. Lee, who doesn't have ninjutsu but is a master of taijutsu, could teach Naruto about focus and determination. He could inspire Naruto to put more of his heart into creating the Rasengan, which in turn could lead to some sort of improvement in the technique.
In some fanfictions, Kakashi could also play a role. He is very knowledgeable and has seen the Rasengan in action. He might offer some tips on chakra control, which is crucial for Naruto to master the Rasengan.
The key element is Naruto's determination. In any 'naruto creates the rasengan fanfic', his unwavering will to master the Rasengan is central. It drives the plot forward.
One popular 'naruto creates the rasengan fanfic' is 'The Rasengan's Genesis' on FanFiction.net. It details Naruto's journey in creating the Rasengan in a really interesting way, with great character development and action scenes.
Maybe Sasuke teaches him the Chidori in a moment of camaraderie. And for the Rasengan, it could be an older and wiser Naruto from the future who travels back in time to teach his younger self.
Sakura. It would be really unexpected as she is mainly known for her medical ninjutsu and physical strength. But if she were to learn the Fire Rasengan, it could show a whole new side of her character. Maybe she'd incorporate her medical knowledge into the technique, like using it in a more precise and less destructive way.
A rogue ninja from a neighboring village who has also mastered a similar but dark - powered version of the Lightning Rasengan. He could be jealous of Naruto's fame and power and wants to prove that his version is superior.
It could be Kakashi. Since he's already Naruto's teacher and he knows both techniques. He could guide Naruto in understanding the intricacies of the Chidori, like how to form the lightning - chakra in his hand, and for the Rasengan, he could give more advanced tips on chakra control.
In many fanfictions, Naruto might master the Rasengan through intense and unique training methods. Maybe he gets some special guidance from an unexpected source, like a hidden shinobi in the village who has a different perspective on chakra control. This person could show Naruto some new ways to focus his chakra, which finally enables him to form the Rasengan successfully.
Well, aside from Naruto, Orochimaru could be a main character in this fanfiction. He has always been interested in powerful and dark jutsu. He might be the one who either creates or tries to steal the dark Rasengan for his own evil purposes. And then there's Kakashi. He could be involved as Naruto's mentor, trying to guide him away from the dark path that the dark Rasengan might lead him to.
Mostly, yes. Fanfiction writers love to play with the idea of Naruto's Rasengan. They might give it new forms, like a lightning - infused Rasengan or a Rasengan that can split into multiple smaller ones. Since the Rasengan is so central to Naruto's character in the original story, it often makes an appearance in fanfiction, but of course, there are always exceptions depending on the unique ideas of each writer.