Yes, there are likely many fanfics out there with the concept of Naruto being at Jonin level. You can check fanfic platforms like Fanfiction.net or Archive of Our Own.
It might be. Some fans really like fanfics that focus on Naruto achieving the rank of Jonin as it shows his growth. However, popularity can vary a lot depending on different fan groups.
Fanfiction could give Naruto godlike powers in various ways. It could be that he is exposed to some kind of ancient and powerful energy source during his training. Or perhaps he undergoes a transformation that not only enhances his physical and ninjutsu abilities but also gives him god - like wisdom and understanding. This could involve him learning from the spirits of past great ninjas and integrating their knowledge and powers into himself, making him a truly formidable and godlike figure.
One great young Jonin Naruto fanfic is 'The Ascent of a Young Jonin'. It focuses on Naruto's journey as he transitions into a Jonin, facing new challenges and forming deeper relationships with his friends. The story has some really exciting battle scenes and character development.
New storylines. Fanfics can create unique scenarios. Maybe Naruto has to team up with unlikely allies as a young Jonin to face a powerful enemy that the village has never seen before. It adds an element of excitement and unpredictability.
One possible plot could be Naruto facing new and tougher challenges as a young Jonin. He might be assigned to lead a special mission that requires him to use his unique skills and leadership abilities. For example, he could be sent to a border area where there are constant skirmishes with enemy ninja. Naruto would have to strategize and protect his team members, all while dealing with the expectations that come with being a Jonin.
He could face some of his old rivals like Sasuke. They have a long - standing competitive relationship, and it would be exciting to see them compete again in the Jonin exams.
Sasuke could also be a main character in the 'naruto jonin exams fanfic'. His skills and his rivalry with Naruto would make for an interesting plotline during the exams. Also, Sakura might be a main character as well. She has grown as a ninja and could show off her new abilities during the jonin exams.