If Naruto is trained by Akatsuki in fanfiction, his skills would be transformed in multiple ways. His chakra control could be refined to a much higher level. Akatsuki members are experienced in dealing with large amounts of chakra, and they could teach Naruto how to better manage his own vast reserves. His combat strategy would shift from the more straightforward and honorable style of Konoha to a more cunning and adaptable approach. He might also gain knowledge about sealing techniques that the Akatsuki has used to capture tailed beasts. This new knowledge could not only enhance his fighting abilities but also give him an edge in dealing with other threats in the ninja world. His ability to sense and counter opponents would be sharpened as well, as the Akatsuki often deals with dangerous and powerful foes.
If Naruto was trained by the Akatsuki in fanfiction, his relationships would be completely transformed. For starters, his relationship with Kakashi would be strained. Kakashi has always been Naruto's mentor in a way, and seeing Naruto side with the Akatsuki would be a shock. His friends like Sakura and Shikamaru would also be confused and probably try to bring him back to the 'right side'. And his relationship with the villagers of Konoha would turn sour as they would fear his new - found Akatsuki - related powers.
His combat skills would become more diverse. He'd likely add some martial arts moves from Batman's repertoire. Also, his stealth would improve a great deal.
Naruto joining Akatsuki in fanfiction would turn his relationships upside down. His friends in the Leaf would initially feel betrayed. However, some might start to question if there's more to Naruto's decision. His relationship with Akatsuki members would be a mix. He'd be constantly in a tug - of - war with Itachi, who has his own plans regarding Naruto. And his interactions with Pain would be intense, as Pain represents a very different ideology from Naruto's. Naruto would have to struggle to find common ground or at least a way to coexist with these new 'comrades' while still holding onto his own values.
His relationship with Sasuke would become even more complex. Sasuke might be suspicious of Naruto's motives for joining Akatsuki, thinking he has truly turned to the 'dark side'. Or, they could end up on opposite sides of a conflict within Akatsuki itself if their goals within the organization differ.
His personality might become more guarded. He'd be surrounded by people who are mostly out for themselves or have very different values from him. So, he'd need to be more cautious in showing his true self.
If Naruto joined the Akatsuki, his relationship with the other Akatsuki members would be diverse. Some, like Hidan, might see him as an enemy no matter what. But others, like Konan, might be more open to him. She has a more complex view of things compared to some of the more blood - thirsty members. Naruto would also have to deal with the Akatsuki's leader, Pein. Their relationship could range from mutual respect to outright hostility depending on Naruto's actions and goals within the organization.
Naruto's character would change significantly. Firstly, he would be more secretive. In Konoha, he was an open book, but in the Akatsuki, he'd have to keep his true intentions hidden. His sense of loyalty would be tested as he'd be in a group that opposes his former home. He may also become more calculating. For example, he'd need to figure out how to use the Akatsuki's resources to his advantage while also trying to protect Konoha in the long run. He would no longer be the naive boy who always rushed into battle; instead, he'd have to think several steps ahead.
Naruto would probably become more serious. Shisui was a serious - minded ninja. His training might make Naruto less impulsive and more calculated in his actions.
It's possible that Naruto's overall physique could be altered. Dragons are known for their strength and agility. So, Naruto might become more muscular and his movements more fluid and graceful. His body could also develop a natural resistance to extreme temperatures, whether it's the searing heat of dragon's fire or the cold of their lairs. This would allow him to endure harsh environments that would normally be difficult for a normal ninja.
Naruto's character would likely become more cynical. Orochimaru's ways are full of deceit and self - gain, and Naruto, being around that, would start to question the ideals he once held. His usually bright and optimistic personality might be clouded with a sense of distrust and a more cut - throat attitude.