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.
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.
In some fanfictions, chakra chains are depicted as extremely powerful and almost unbreakable. They can be used to bind opponents tightly, restricting their movement and jutsu use.
In such a fanfiction scenario, Naruto would be extremely powerful. He could easily overpower his opponents during the Chunin Exams. The other genin would be in awe or extreme fear. His control over the ten - tails' power would likely be a major plot point, as it's such a vast and dangerous amount of chakra.
In some fanfictions, Naruto might gain the ability to use Mokuton through a special training or a unique encounter. For example, he could have met an ancient sage who imparts the knowledge of Mokuton manipulation. Another possibility is that it's a result of some experimental jutsu gone wrong or right that gives him this unexpected power.
In fanfiction, Naruto using Hiraishin in the Chunin Exams could completely change the dynamics. He could surprise his opponents with his sudden teleportation. This would make him a much more formidable opponent compared to the original story. Maybe he could use it to quickly dodge attacks and counter - attack in ways that no one expected.
Chakra chains in Naruto fanfiction during the Chunin Exams could potentially be used as a unique form of attack or defense. Maybe a character has developed a special jutsu involving chakra chains and uses it to gain an advantage in the exams, like for capturing opponents or protecting themselves from attacks.
In a fanfiction where Naruto has 10 tails during the Chunin Exams, the story would be turned on its head. For starters, Naruto's growth arc that we see in the original series would be altered. He wouldn't have to struggle in the same ways to gain power. During the Chunin Exams, instead of facing challenges from his peers, he might face challenges from the entire ninja world. The Akatsuki, for example, would be very interested in him. His training would be more about controlling the ten - tails' power rather than learning basic ninjutsu. His friends and teachers would have to adapt to this new Naruto. And Naruto himself would have to deal with the isolation that often comes with great power. The Chunin Exams would no longer be a simple test but a stage for a much larger power struggle.