Naruto's view of right and wrong would be severely tested. Orochimaru's actions are often morally ambiguous. If Naruto is trained by him, he may start to see the world in shades of gray rather than the black - and - white view he had before. He might be more willing to use underhanded tactics in battle. For example, he could use Orochimaru - style poison attacks, which he would have previously considered unethical. His relationships with his friends in Konoha would also be strained as they might not understand or approve of his new ways.
Naruto would likely become more secretive. Since Orochimaru's training methods are often not in line with Konoha's values, Naruto would have to hide what he's learning. He might also become more distrustful of others as Orochimaru could instill in him the idea that everyone is out to get him for his newfound power.
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.
Naruto's morality could be somewhat skewed. Orochimaru has a very different view on right and wrong compared to Naruto. So, Naruto might start to question some of his previous beliefs. For example, he might be more willing to use dangerous or forbidden jutsus if it means achieving his goals. He'd also probably be more distrustful of others, as Orochimaru always has ulterior motives. This would be a big change from the Naruto who was always so quick to trust and befriend people.
Naruto would become more cunning. Orochimaru is a very sly character, and his training would likely rub off on Naruto. Naruto would no longer be as straightforward in his battles and interactions. He might start to think several steps ahead, like Orochimaru does.
Naruto would likely become more secretive. Since Orochimaru is a very private and often devious character, Naruto might pick up some of those traits. He would probably keep things from his friends more often.
If trained by Orochimaru, Harry's magic could change in several ways. Firstly, he might develop a more aggressive and offensive style of magic, as Orochimaru is often focused on power and combat. Secondly, he could start using magic in a more self - serving way, rather than for the good of others as he was taught at Hogwarts. And finally, his connection with magical creatures might change, especially if Orochimaru introduced him to some of the more dangerous and exotic creatures in his world. Harry's magic would no longer be the pure and somewhat naive magic he had before, but a more complex and potentially dangerous form of magic.
Naruto would likely become more stealthy. Itachi is known for his stealth and if he trains Naruto, Naruto would pick up some of those skills. He might start to rely less on his brash and straightforward fighting style and incorporate more subtlety.
Naruto would likely become more serious. Madara's influence would probably make him less impulsive. For instance, he would think twice before charging into battle without a proper plan.
He'd probably become more adaptable. Naruto is already flexible in combat, but RWBY's diverse combat styles would force him to be even more so. His personality might also become more open - minded as he experiences the different cultures and ways of thinking in the RWBY world.
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.
Naruto's character would become more serious. Sephiroth's training is no joke and Naruto would have to focus more. He might lose some of his naivete and become more worldly.