His fighting style would surely change. Since Cus may have different combat philosophies, Naruto would incorporate new moves and strategies. For example, if Cus emphasizes stealth, Naruto would start to use more covert tactics rather than his usual head - on approach. He would also become more versatile as a ninja, being able to adapt to different situations better.
Naruto's character would grow in terms of his understanding of the ninja world. Cus could expose him to different ninja clans and their ways. This would make Naruto more open - minded. He would no longer be just the hyperactive and somewhat naive Naruto from the start. His decision - making would be more informed, as he has learned from Cus's wisdom. His relationships with his friends might also change slightly, as he now has new knowledge and abilities that could either bring them closer or cause some initial friction as they adjust to the new Naruto.
Naruto's confidence might increase. With Cus's training, he could master new skills more quickly, which would boost his self - assurance in battles.
When trained by Ibiki in fanfiction, Naruto's character would experience a significant transformation. He'd lose some of his naivete. Ibiki's world is full of deception and danger, and Naruto would have to adapt. He'd become more calculating, weighing the pros and cons of his actions more carefully. His sense of humor might also change, becoming more dry and sarcastic as he gets used to Ibiki's gruff personality. His relationships with his friends could be affected too, as he might seem more distant at first while he adjusts to his new mindset.
Naruto might become more reserved. Since Obito has a more brooding personality, Naruto could pick up on some of that. His once - bright and exuberant nature might be tempered.
When trained by Deidara in fanfiction, Naruto's view of art could change. Deidara has a very distinct view of art as something that is transient and explosive. Naruto might start to see the beauty in destruction in a way, which could make his character a bit darker. His attitude towards his enemies might also change. Instead of always trying to redeem them, he might be more willing to use forceful and destructive means to defeat them, as he has learned from Deidara's combat approach.
He might become more disciplined. Gai's training is very structured, so Naruto would have to follow a strict routine, which could make him more organized in his approach to things.
The story would change a great deal. Naruto's power - up would be significant. He could face tougher enemies more easily. His friends might be both amazed and a bit worried about his new, more aggressive style. The overall tone of the story could shift towards a more action - packed and intense direction.
The training by death would likely toughen Naruto up both physically and mentally. He'd probably have a darker, more determined edge to his character. He might be more solitary in his training, spending more time alone to master the skills death has taught him. This could make him seem a bit more distant to his friends initially, but in the long run, it would make him a stronger and more reliable ally.
Naruto becomes more confident. After the time - skip and toad training, he knows he has the skills to face tough opponents. He's no longer the underdog who doubts himself all the time. His appearance might also change slightly to reflect his growth. Maybe he has a more serious look in his eyes. His sense of humor could still be there, but it's more refined, not as brash as before.
When trained by Nagato in fanfiction, Naruto's character development would likely involve a growth in his understanding of power. Nagato has a different approach to power compared to Naruto. Through Nagato's training, Naruto may learn that power isn't just about physical strength but also about knowledge and the ability to make tough decisions. This could add a new layer of maturity to Naruto's character.
His character might become more cautious. Kakuzu is a cautious fighter, and Naruto could pick up this trait. He would be less likely to rush into battles without a proper plan.
Naruto's character could become more complex. He may start to question some of the values he learned in Konoha. With Yami's influence, he might be more inclined to take risks that he wouldn't have before.