Well, Naruto's personality would be a blend of his original self and the values he'd learn from Kenshin. He'd be more honorable. His word would carry more weight. He'd also be more self - disciplined. Kenshin's strict training regime would instill in Naruto a sense of discipline that he might not have developed as quickly in the original story. And his relationship with his friends would be different. He'd be more of a guiding figure, influenced by Kenshin's role as a mentor - like figure in his own life.
Naruto would likely be more empathetic. Kenshin has a deep understanding of the pain of others due to his own past. Naruto, under his care, would develop a stronger sense of empathy. He would be more likely to try to understand the motives of his enemies before attacking. His sense of humor might also change. It could become more subtle, influenced by Kenshin's more serious nature.
Well, it could be really interesting. Naruto's energetic and determined nature combined with Kenshin's sword skills and sense of justice. Maybe Naruto would learn a different style of combat from Kenshin. He could also inherit Kenshin's philosophy of not killing unnecessarily. Naruto might grow up with a more refined sense of honor and chivalry.
His body build could also change. Kenshin is a very agile and muscular samurai. Naruto might develop a more lean and muscular physique, which would enhance his speed and strength in combat. This new appearance would not only set him apart from the regular Naruto but also show his connection to Kenshin Himura in this fanfiction world.
Kenshin's training might make Dark Naruto more disciplined. His impulsive and dark nature could be toned down as he learns Kenshin's ways.
His personality would likely be more subdued. Ebisu is a rather proper and disciplined character, so Naruto would probably be less rambunctious.
His personality would likely be more reserved. Manda is not a very expressive or warm - hearted being, so Naruto might not be as outgoing as in the original story. He'd be more cautious and calculating, having learned from Manda's survival instincts.
Naruto's personality would change a great deal. He'd be less naive. Pein has seen a lot of the dark side of the world, and raising Naruto would expose him to that. So Naruto would be more world - weary. He may also be more ruthless in achieving his goals, as Pein doesn't shy away from extreme measures.
Naruto might be more assertive. Since Kushina was a strong - willed person, Naruto would likely inherit some of that. He would be less likely to be pushed around and more likely to stand up for himself earlier. Also, he might be more family - oriented as he would have grown up with a loving mother figure in Kushina.
Naruto's personality would be a blend of his original self and Zeref's traits. He may still have his determination but it could be a darker kind of determination. His sense of humor would probably be lost as Zeref doesn't seem the type to encourage light - heartedness. Also, he could be more secretive, not as open as he is in the original Naruto series because Zeref often keeps his own council.
It could be really interesting. Maybe Naruto would have Kenshin's sword skills. He might use a katana instead of his ninja tools and have a more samurai - like fighting style while still having his ninja abilities.
He'd probably be more reserved. Kakashi is not as boisterous as some others, so Naruto might pick up on that. For instance, he might not shout as much about becoming Hokage right away.