One possible plot twist could be that Naruto has to face an unexpected opponent during the Chunin Exams. Maybe a rogue ninja infiltrates the exam and targets Naruto specifically because of his Nine - Tails power. Another twist could be that the rules of the Chunin Exams are suddenly changed in the middle, forcing Naruto to adapt quickly. For example, they might add a team - vs - team battle where Naruto has to work with his former rivals.
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.
Well, in some fanfiction concepts, Naruto might have some sort of mental breakthrough. Maybe he has a deep connection with the Nine - Tails due to some special training before the Chunin Exams. This connection allows him to access and control all of the Nine - Tails' power without being completely overrun by it.
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I recommend the novel "Time Travel Begins From Invincibility". This fantasy novel was about the main character, Li Xiaoqi, who was invincible after transmigrating to the Deity Continent. However, because of this, the entire plot was too brainless and repetitive. Therefore, the story started from five years after the main character transmigrated. It was mainly about the battle of wits and the powerful soldiers and generals under him. I hope you like this fairy's recommendation. Muah ~š
In the fanfiction, after they become Chunin, they might be assigned on more difficult missions together. This would force them to rely on each other even more. They could have long conversations during these missions, discussing their past experiences, their families, and their dreams. Naruto might share his dream of becoming Hokage in more detail with Shikamaru, and Shikamaru could talk about his desire to make the village a better place using his intelligence. Through these shared experiences and conversations, their friendship would grow deeper.
Naruto's training would likely become more intense. He might focus on mastering new jutsus like the Rasengan variations. He could also train in stealth and strategy more, as those are important for a Chunin. For example, he could practice sneaking up on opponents and setting up traps.
The other genin would be in awe. They would see Naruto as an almost unbeatable force. Some might be scared, like those who are not used to seeing such a powerful display. For example, the weaker genin might feel completely outclassed.
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.