One possible reason could be extreme pressure. The Chunin Exams are highly competitive and Naruto might have felt that he was constantly failing and disappointing those who believed in him. Maybe he saw no way out of the situation and in a moment of despair, decided to end his life.
It could also be due to a deep sense of guilt. Maybe Naruto accidentally caused harm to someone he cared about during the Chunin Exams, like a teammate or a friend. Unable to bear the guilt of his actions, he might have chosen to take his own life as a form of punishment.
One possible reason could be extreme heartbreak. If in the fanfic, Sasuke does something unforgivable like completely rejecting Naruto's long - held friendship and trust, it might push Naruto over the edge. He has always placed great importance on his bond with Sasuke, and if that is shattered in a way that seems irreparable, it could lead to his self - destruction.
One possible reason could be heartbreak. If Harry was deeply in love with Hermione and she chose someone else, like Ron, the pain of rejection could be too much for him to handle. Another reason might be if Hermione betrayed Harry in some way, like revealing his secrets to the enemy. This sense of betrayal could shatter his trust and push him to the edge.
Another reason could be related to his personal goals. Naruto might have something else in mind that he believes is more important than taking the Chunin Exams at that moment. For example, he could be focused on finding out more about his family or some mystery in the village. He may also not want to participate because he doesn't want to be part of the traditional system that he might view as unfair or too rigid. He's always been a bit of an outlier, and the Chunin Exams represent a very structured and competitive event that might not appeal to his free - spirited nature.
One possible reason could be that he gets injured right before the exams and is unable to participate. Maybe he was on a mission that went wrong and he has to recover instead of taking the exam.
Yes, there might be such fanfics out there. Fanfic writers often explore alternative storylines, and this would be a very dark and unexpected twist to the original Naruto story. It goes against the strong bond and rivalry that Naruto and Sasuke have in the canon, but that's the allure of fanfiction - to see what could happen if things took a drastically different turn.
Well, in the original storyline, Naruto is a very resilient character. He faces numerous challenges during the Chunin Exams but never gives up. He always tries to find a way forward. In this fanfic, the very act of Naruto killing himself is a huge deviation as it goes against his core character trait of perseverance.
In such a fanfiction, the plot could involve Naruto being pushed to the extreme during the Chunin Exams. Maybe he witnesses some great injustice or threat to his friends that makes him cross his moral line and kill. For example, if an enemy tries to assassinate Sasuke during the exams and Naruto, in a fit of rage and desperation to protect his friend, uses a powerful jutsu that ends up killing the attacker.
One reason could be if Sasuke was somehow possessed by a powerful and evil force during the Chunin Exams. Naruto might see no other way to stop this threat and be forced to kill Sasuke to protect the village and others. Another possibility is a huge misunderstanding. For example, if Sasuke was framed for a crime he didn't commit and Naruto was misled into believing he was a danger.
The interference of external forces. In fanfiction, there could be some hidden enemies or manipulators who are trying to make Naruto lose control during the Chunin Exams. They might be spreading false rumors about him or creating situations that are designed to break his spirit, such as framing him for cheating or something similar.
One possible reason could be that Naruto realizes the Chunin Exams have become too dangerous and he doesn't want to risk his life or the lives of his friends. Maybe he sees the dark side of the competition, like how some contestants are willing to cheat or harm others to win.