There could be other characters like Sasuke. He might be Naruto's rival in martial arts as well, constantly challenging Naruto to improve. And Sakura could also be involved. Maybe she becomes interested in martial arts because of Naruto and starts learning from him. Also, Kakashi could play a role as Naruto's mentor in martial arts, guiding him with his own knowledge and experience.
His old disciples might be main characters. They could visit him and seek his advice on their own martial arts journey or personal problems.
Naruto himself is often very popular. Writers love to take his already - powerful skills and develop them further in fanfiction. They might give him new jutsu or have him face even greater challenges to show his growth.
Madara Uchiha. He is extremely powerful with his Sharingan and Rinnegan abilities. Even if Naruto is a martial arts master, Madara's vast array of jutsu and his strategic mind would make him a formidable foe. He could use his space - time ninjutsu to avoid Naruto's attacks and then counter with powerful attacks of his own.
Well, it could be about Naruto achieving new and powerful martial arts skills. Maybe he combines his ninja techniques with martial arts moves to create unique combat styles.
Obviously Naruto is going to be a central figure. Other important characters might include his mentors like Jiraiya. Jiraiya could offer guidance to Naruto during this time when he's feeling like he has no real mastery. Then there are his comrades like Shikamaru who might use his intelligence to try and figure out what's wrong with Naruto. And of course, villains from the Naruto world might also be involved, seeing Naruto's vulnerability as an opportunity to cause chaos in the ninja world.
Well, aside from Naruto, there could be some original characters created specifically for this fanfiction. Maybe there's a mysterious figure who is an expert in stealth and becomes Naruto's guide or adversary. And of course, Kakashi Sensei could also be involved. He could be the one who initially notices Naruto's potential in stealth and encourages him to develop it further, guiding him through various training exercises and missions related to stealth.
Well, it could be an original character created specifically for the fanfiction. This character might be someone who has a natural affinity for energy manipulation and is on a journey to become a master. They could start off as a nobody in the Naruto world but gradually rise to prominence.
Well, Naruto is surely a main character. And depending on the plot, characters like Kakashi could be important. He's Naruto's teacher and might try to guide Naruto away from the allure of darkness. Also, Orochimaru could be a key figure. He's always been associated with dark arts in the Naruto series, and in this fanfiction, he might play a role in Naruto's exploration of the darkness, either as an ally or an enemy.
Obviously Naruto would be one of the main characters. But depending on the story, there could be other characters like Sasuke, Sakura, or even some original characters created by the fanfiction author.
Most likely Naruto would be one of the main characters, since it's in the title. There might also be his friends like Sasuke and Sakura who could be involved in the story related to his new power of gravity mastery.