Naruto could develop a darker side to his personality. Since Orochimaru is known for his dark jutsu and unethical practices, Naruto might be influenced. But at the same time, his core values of protecting his friends and the village could be strengthened as he realizes he needs to be strong enough to resist Orochimaru's negative influence. Orochimaru might become more interested in Naruto's potential for good rather than just using him for his own evil plans.
Potential character development for Naruto could be that he becomes more adaptable. Serving Orochimaru would put him in situations he's not used to, forcing him to think on his feet. He may also develop a darker side, as Orochimaru's influence seeps in, but at the same time, he could become more determined to uphold his own values. As for Orochimaru, he might start to respect Naruto's tenacity and might even consider changing his ways a bit, or at least re - evaluating his plans in light of Naruto's presence.
Hanabi could become more confident. With Naruto's training, she might start believing in her abilities more. For example, if Naruto encourages her during tough training sessions, she'll feel more self - assured in her skills.
In a fanfiction like this, Orochimaru could train Naruto in the ways of stealth and assassination, skills that Orochimaru is quite proficient in. Naruto would initially be hesitant but realizes that these skills can be used for good. For example, to infiltrate enemy bases and gather intelligence to prevent wars. This would change Naruto's fighting style and make him more versatile in the shinobi world.
You could look for fanfictions on platforms like FanFiction.net or Archive of Our Own. Try searching with the exact phrase 'Orochimaru trains Naruto' and then filter through the results to find ones that are well - written. Some might focus on Orochimaru teaching Naruto forbidden jutsu in a way that doesn't corrupt him but instead enhances his abilities.
Naruto's character could develop in terms of his understanding of different moral compasses. Kisami and Itachi have their own set of values which are very different from Naruto's. By being with them, Naruto might question some of his own beliefs and grow from that self - reflection. Kisami might develop a sense of loyalty towards Naruto, which is new for him as he has always been more self - serving. Itachi could find in Naruto a new reason to fight for a better future for the ninja world, leading to a change in his usually stoic and secretive demeanor.
He may develop a deeper understanding of the balance between power and control. With the Wabisuke in his possession, he has to learn how to use its power without losing himself. This could lead to him growing in wisdom and self - restraint. He might also become more isolated as he tries to master the weapon on his own at first, but then later realize the importance of his friends' support and grow closer to them in a new way.
For Naruto, he might gain new combat skills influenced by Matatabi. His fighting style could become more fluid and unpredictable, like Matatabi's nature. Matatabi could start to show more compassion. Maybe through Naruto's positive influence, it begins to care more about the humans and the ninja world in general. This would be a big change for a tailed beast.
For Naruto, he would have to grapple with the fact that he is fighting his former friend. This could make him more solemn and determined. He might develop a darker side as he realizes the seriousness of stopping Sasuke. For Sasuke, he could start as overconfident in his power but as Naruto keeps pushing him back, he could become more desperate and start to question his own motives.
A character like Sasuke could be further developed in Orochimaru's lab fanfiction. He might struggle more with the dark knowledge he gains there and eventually find a way to use it for the greater good. Another character could be a new, made - up test subject who starts out as a scared victim but then becomes a strong fighter after enduring the experiments. And Kabuto, who is already associated with the lab, could have a change of heart and try to atone for his actions in the lab.
Naruto's character development might include a deeper sense of responsibility. Since he is the son of Amaterasu Okami, he may feel a greater obligation to protect the world. He could develop new skills not just in combat but also in diplomacy. He has to deal with different factions in the ninja world who have different views on his new status. This would force him to grow and mature in ways he hadn't before.