Jiraiya could also be involved. He is Naruto's mentor in many ways. In this fanfic, he might be more strict and focused on Naruto's growth. He could train Naruto in more dangerous and challenging environments to toughen him up.
One possible trainer could be Kakashi. He might take Naruto's training more seriously and push him to his limits. Kakashi has a lot of experience and knowledge, and he could use more extreme methods to train Naruto.
There could be new trainers as well. Maybe some retired but highly skilled ninjas come out of retirement to train Naruto. They would bring in different techniques and perspectives that Naruto hasn't been exposed to before, which would greatly enhance his skills and abilities.
Well, he might start with more intense physical drills. Like running longer distances with heavier weights. This would build his stamina and strength much faster than before.
When writing a Naruto serious training fanfic, start by setting the scene. Is it in Konoha? Or in a far - off land? Then, think about the types of training he'll do. Will it involve sparring with powerful opponents? Or maybe learning from scrolls? Incorporate other characters too. Maybe Sasuke challenges Naruto during his training, or Sakura helps him with his medical ninjutsu training as part of his overall development. And make sure to keep the Naruto spirit alive - his will to protect his friends and become Hokage should be a driving force throughout the story.
One great Naruto serious training fanfic is 'The Path of the Prodigy'. In this fic, Naruto embarks on a super intense training regime under the guidance of an old sage. It really shows his growth and determination.
Jiraiya could be another main character. He is Naruto's mentor, and it's very likely that he would accompany Naruto on this serious training trip. Jiraiya's vast knowledge and experience would play a crucial role in Naruto's growth during the journey.
Kakashi could be another one. Since he's already Naruto's teacher in the original story, it's not a stretch to think he could start training Naruto even earlier in the fanfic. He could focus on different aspects of Naruto's abilities, like improving his stealth or his chakra control even more.
The Hokage, like Tsunade or Kakashi, could be the ones training Naruto. They know Naruto well and have a lot of knowledge and skills to pass on.
You can start by checking out fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto serious ninja' and you'll get a whole list of stories.
In this fanfiction, Naruto's serious training could be a turning point for his character. As he trains, he might encounter new challenges and mentors that shape his values. He could develop a stronger sense of purpose, not just to be recognized, but to truly master his skills for the sake of protecting his village and friends. This new - found determination might lead him to explore different jutsu and strategies, further evolving his combat style and overall character.
One challenge could be the physical exhaustion. Jiraiya's training is likely to be very demanding physically, and Naruto might struggle to keep up with the intense workouts.
One common theme is self - discovery. Just like in the original Naruto story, characters in fanfics often go through a journey of understanding themselves better. Another theme is redemption. For example, characters who made mistakes in the original story might seek to make up for it in the fanfic. And of course, the theme of friendship and loyalty still holds strong, as it was a big part of the Naruto series.