In " One-punch Superman," Fubuki was a very powerful character. She was called the " Arriver ", which meant that she was comparable to a god-level existence. Compared to god-level existences, those who reached the level of god-level existences could be said to be extremely powerful existences, and could even be considered existences that surpassed gods.
In novels, god-level existences usually referred to universe-level powerhouses with invincible power and abilities. And those who reached it could be comparable to god-level existences, which meant that their strength was very powerful and could even threaten the existence of the universe.
In " One Punch Superman ", the level of the person who had reached the level of Fuubutsu could be said to have surpassed the existence of gods. It was a very powerful level.
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.
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.
One Punch Man is about a guy named Saitama who can defeat any enemy with just one punch. But despite his amazing power, he struggles with the boredom of having no real challenge.