One common theme is the growth of their relationship. They start to understand each other better. Another theme is power - up. They gain new abilities or improve existing ones during the training.
In the fanfiction of their training trip, there are several possibilities. Naruto, being the energetic one, would probably push Hinata out of her comfort zone. They could meet some strange characters who give them unique training methods. For example, they might find an old hermit who teaches them a special type of chakra control. This would not only enhance their skills but also bring them closer as they face challenges together. Their bond would likely grow stronger as they rely on each other during this trip.
Their relationship develops as they train side by side. Naruto starts to notice Hinata's determination and strength, which makes him see her in a new light. Hinata, on the other hand, becomes more confident around Naruto.
During the training trip, they might face some tough opponents. This would force them to rely on each other and grow closer as a result. They could also discover new places with unique chakra sources that enhance their abilities.
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.
In the fanfiction's training trip, Naruto may encounter some spiritual beings. These beings could be related to the origin of chakra or some long - forgotten ninja legends. Interacting with them would be a very different experience for Naruto. He would have to use not only his physical skills but also his wits and understanding of the ninja world's deeper mysteries to communicate with them. This could lead to a major transformation in his ninja journey, as he delves deeper into the spiritual side of the ninja arts.
He could meet an old hermit ninja who imparts his wisdom and knowledge to Naruto. This hermit might have been living in seclusion for years, but seeing Naruto's potential, decides to teach him things not found in normal ninja training.
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.
Naruto might meet some foreign ninjas from far - off lands that have completely different fighting styles. These ninjas could teach him new ways to use his chakra and improve his combat abilities. He may also encounter some mysterious hermits living in the mountains or forests who possess great wisdom and unique jutsu. They could guide him on his journey of self - improvement and give him valuable advice on how to become stronger as a ninja.
In a Naruto Hinata training fanfiction, the author could explore Hinata's inner strength. Maybe she's training to overcome her shyness as well as improve her combat skills. Naruto, being the supportive friend, helps her break out of her shell. This could lead to some really interesting character development for both of them, and perhaps even a budding romance in the future.