If Naruto is trained by Deathstroke in fanfiction, he would likely gain a whole new set of skills. Deathstroke is known for his proficiency in various weapons and hand - to - hand combat. Naruto could learn to be more efficient in close - quarters combat. Also, Deathstroke's strategic mind might help Naruto better understand his opponents' weaknesses, enabling him to come up with more effective battle plans.
If Naruto is trained by Deathstroke in fanfiction, his character would change in multiple ways. For one, he might lose some of his naivete. Deathstroke's world is a harsh one, and Naruto would have to adapt. He could become more calculating and less likely to jump into a fight without thinking. His relationships with his friends might also change. He might start to keep them at a bit of a distance, not wanting to put them in danger as a result of his new, more dangerous fighting style.
If Naruto is trained by RWBY fanfiction, his world view could be greatly expanded. RWBY has a different setting and set of values compared to Naruto's world. Naruto might start to see things from a different perspective, like how RWBY characters deal with the concept of Grimm and their own personal growth. This could lead to him evolving not just as a fighter but also as a person, and he might bring back some new ideas to his own village to improve it.
Well, in a fanfiction where Naruto is trained by Deidara, Naruto's creativity in combat would probably skyrocket. Deidara is all about his explosive art, and Naruto could learn to use chakra in ways he hadn't thought of before. Maybe Naruto would start using the environment in a more explosive way during battles, like turning rocks into mini - explosives like Deidara does with his clay. Also, Naruto might have to struggle with Deidara's nihilistic attitude towards life at times, but it could also make him more empathetic towards enemies with different outlooks in the long run.
Well, Naruto might become extremely powerful. The Sandaime Hokage has a wealth of knowledge and skills. He could teach Naruto some very unique jutsu and also help him better understand the values of the village. Maybe Naruto would grow faster in terms of combat skills and leadership abilities.
In this kind of fanfiction, Naruto might gain some unique and dark powers. Since the Akatsuki members are known for their powerful and often unorthodox techniques. He could learn more about the secrets of the ninja world from a different perspective, but also risk being influenced by their more amoral views.
In a fanfiction where Naruto is trained by Sanji, it could be really interesting. Sanji could introduce Naruto to the concept of using food as a source of energy in a more direct way. Naruto's rasengan might even get a new variation where he incorporates elements of Sanji's cooking. Maybe he could create a 'Rasengan - Spicy Curry' version. Also, Sanji's loyalty to his crew could inspire Naruto to be more dedicated to his village and friends.
Well, Naruto would probably become extremely powerful. Whis' training methods are very unique and strict. Naruto, with his already strong will and determination, could learn new combat techniques and gain a better understanding of energy control. He might even develop some new forms or abilities that combine his ninja skills with Whis' teachings.
If Naruto were trained by the Avengers, his fighting style would change drastically. The Avengers' training methods are quite different from what Naruto is used to in the ninja world. He might start using more teamwork strategies similar to the Avengers. Also, he could pick up new ways of thinking about combat. Maybe he'd start to think more about protecting the whole world on a larger scale like the Avengers do, instead of just focusing on his village. This could lead to him having a different perspective on his ninja duties.
In a fanfiction where Naruto is trained by Kakuzu, Naruto's view of the ninja world might change. Kakuzu has a rather cynical view due to his long life and the many betrayals he has faced. This could either make Naruto more understanding of the darker side of the ninja world or it could make him more determined to change it for the better. On the physical side, Naruto might gain more control over his chakra, as Kakuzu is very proficient in chakra management. He could also learn some new combat strategies that are different from what he has learned from Jiraiya or Kakashi, which would expand his arsenal in battles and make him an even more formidable opponent.
In this kind of fanfiction scenario, Naruto might become an even more powerful ninja at a faster pace. Tobirama was a highly skilled shinobi with a lot of unique jutsu knowledge. He could teach Naruto some of his advanced water - style jutsu, which would add a new dimension to Naruto's combat abilities. Also, Tobirama was good at strategic thinking, so Naruto could learn more about battle tactics from him.