His relationships would change a great deal. His friends might feel a bit overshadowed by his new power. For instance, Sasuke might feel even more compelled to compete with Naruto, but also realize the futility of it. His relationship with Sakura could become a bit strained as she might be in awe and a bit intimidated by him now.
If Naruto had One Punch Man's powers in a fanfiction, he would be ridiculously overpowered. He could probably defeat any of his foes with a single punch. His fights would become very one - sided, and it might change the entire dynamic of the Naruto universe. For example, he could easily take on the Akatsuki single - handedly without much effort.
The storyline could be amazing. Naruto with One Punch Man's power would make him nearly invincible. He could defeat any enemy in the Naruto universe with just one punch. This would change the power dynamics completely. For example, battles against the Akatsuki would be over in an instant. His friends might be both in awe and a bit worried about his newfound, overwhelming strength.
Yes, there likely is. The Naruto and One Punch Man fandoms are both quite large, and it's common for fans to create crossover fanfictions. These crossovers can be really interesting as they combine the unique elements of both universes, like Naruto's ninja skills with Saitama's one - punch power.
Saitama's strength is so great that it might disrupt Naruto's more delicate chakra - based techniques at first. But Naruto, being a quick learner, could adapt. He might use his shadow clone jutsu to surround Saitama and direct his attacks in a more coordinated way. On the other hand, Saitama could be immune to some of Naruto's genjutsu because of his simple - minded focus on punching. However, if Naruto used a powerful enough genjutsu, it could potentially distract Saitama long enough for a strategic move.
Another idea is that Naruto, curious about other powerful beings, uses a jutsu to travel to the One Punch Man universe. There, he would be amazed by Saitama's strength. Naruto could try to learn from Saitama how to be so effortlessly strong, but Saitama would probably just shrug it off and say there's no special trick. They could team up to fight some of the monsters in Saitama's world, with Naruto using his ninjutsu and Saitama just punching things away.
I'm quite sure there exists a 'Naruto is One Punch Man' fanfic. The world of fanfiction is vast and full of all kinds of creative crossovers. Writers might be intrigued by the idea of bringing Naruto's ninja skills and the unique world of One Punch Man together. For example, how would Naruto react to the overpowered villains in One Punch Man's world? And how would Saitama view Naruto's determination to protect his village? These are the kind of things that could be explored in such a fanfic.
Naruto's character would develop in a very different way. He might become more confident, almost to the point of cockiness at first. But then he would likely realize the weight of his power. He would have to learn to control it, which could be a new form of character growth for him.
A plot could involve Saitama ending up in the Naruto world. He quickly realizes that the power levels here are different. He may get involved in the ninja wars, using his one - punch ability to end battles quickly. Naruto, intrigued by Saitama's power, tries to figure out how he can achieve such strength. Meanwhile, the villains in the Naruto world start to fear this new, extremely powerful intruder.
In some fanfictions, his psychic powers are shown to have a much wider range. He can control more than just the usual objects. For example, he might be able to manipulate time on a small scale using his psychic powers.