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 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.
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.
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.
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.
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 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.
Naruto's character could change in several ways if trained by Kisame in fanfiction. Firstly, his confidence might take on a different form. Instead of the boisterous and sometimes over - the - top confidence he has, it could become a more subdued and internalized self - assurance. His relationships with his friends in Konoha might also be affected. He might feel a bit of an outsider now that he has been trained by an enemy. Emotionally, he could become more guarded, as Kisame is not one to show much emotion. And in terms of his fighting style, he might adopt a more stealthy and patient approach, which is very different from his usual in - your - face style.
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.
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.
Naruto's confidence might increase. With Cus's training, he could master new skills more quickly, which would boost his self - assurance in battles.