Perhaps it's an old enemy who has a change of heart. This enemy could think that by training Naruto, they can make amends for their past wrongs. But Naruto, being cautious, denies the offer as he still has doubts about this former foe's true intentions.
It could be due to the current situation in the village. There might be threats that required Naruto to stay. Tsunade, as the Hokage, had to consider the overall safety and stability of the village. So, she denied Naruto's request for the training trip to ensure he was available in case of any emergency.
He might become more determined to prove himself to Tsunade. This could make him train even harder within the village. He could also start to question Tsunade's decisions and try to find ways to convince her that he is ready for such a training trip in the future.
Naruto might initially be very disappointed. He has always been eager to train and become stronger. So being denied by Kakashi could make him feel a bit down. But he could also be defiant. He might start training on his own, determined to show Kakashi that he doesn't need his approval to get stronger.
In the 'naruto denied training fanfiction', perhaps Naruto denies the training because he doesn't trust the person offering it. Naruto has had his fair share of enemies and untrustworthy characters. If the trainer is someone he doesn't know well or has a bad feeling about, he would surely turn down the training. Also, he might be confident in his own self - taught skills and the training he has received from his masters like Jiraiya.
One possible reason could be that Kakashi might think Naruto is not ready yet. Maybe Naruto hasn't mastered some basic skills that are prerequisites for the more advanced training Kakashi has in mind. Another reason could be that Kakashi is worried about Naruto's recklessness. Naruto has a tendency to rush into things without thinking, and Kakashi might fear that this could lead to Naruto getting seriously injured during the training.
Perhaps in 'naruto denied training trip fanfiction', the story focuses on how Naruto copes with the denial of this important journey. He might have to find other ways to become stronger, which could involve exploring different jutsu or training methods within the village. This could lead to unique interactions with characters like Iruka or Kakashi, as they try to help him in a different way than in the original story.
He might meet some of the past hosts of the Kyuubi. These past hosts could share their experiences with Naruto, giving him valuable insights on how to handle the power of the Kyuubi. It could be like a gathering of all those who have carried this great burden and power before him.
Sure. In this kind of fanfiction, Naruto doesn't go on his training trip. So instead of getting stronger in the ways he did in the original story, he has to stay in the village. He might start to feel left behind as his friends progress. Maybe he tries to train with different people in the village, like the older ninjas who are retired but still have knowledge to share.
Well, in this fanfiction's training trip, Naruto may come across different clans with their own exclusive fighting styles. He could engage in friendly sparring matches with their members, which would not only enhance his combat abilities but also his understanding of different cultures within the ninja world. He might also find some ancient artifacts that hold great power and have to figure out how to use them properly without being corrupted by their power.
It could be a former Death Eater who has had a change of heart. This person might see the error of their ways and decides to secretly train Harry, believing that he is the only one who can truly defeat Voldemort. They could teach Harry some of the Dark Arts that Voldemort uses, so that Harry can better understand and counter them.