If trained by Zabuza, Naruto would probably grow in terms of his combat intelligence. He'd learn to read his opponents better. His personality could become more stoic, as Zabuza is not one for excessive emotions. But Naruto would also bring some of his own warmth to Zabuza's cold - blooded training regime. He might try to humanize Zabuza and in the process, become a more complex character with a blend of Zabuza's ruthlessness and his own compassion.
His sense of strategy would improve. Zabuza is a tactical fighter, and Naruto would learn to plan better in battles.
Naruto's character would become more hardened. Zabuza's influence would make him less naive. He would be more calculating in battles and less likely to rush in without a plan. His view of the ninja world might also change. He could see the darker side of it more clearly.
In a fanfiction where Naruto is trained by Zabuza, Naruto would gain a whole new perspective on fighting. Zabuza's style is very different from what Naruto has learned so far. Zabuza could teach Naruto about the importance of misdirection in combat, like how he uses the mist to hide his movements. Naruto might also pick up on Zabuza's ability to analyze an opponent's weaknesses quickly. This training could potentially make Naruto a more well - rounded fighter, able to adapt to different situations more easily. However, he would need to be careful not to let Zabuza's more cut - throat approach overtake his own kind - hearted nature.
He could learn Zabuza's signature water - style jutsu, like the Hidden Mist Technique. This would give Naruto an advantage in terms of creating diversions and hiding his movements during battles.
His confidence could grow significantly. By being able to save two powerful ninjas, Naruto would prove to himself that he is capable of great things. He may start to believe more in his own abilities and take on more challenging tasks without hesitation. For example, he might be more willing to take on stronger opponents in future battles.
Naruto's character could develop in terms of his understanding of the ninja world. Zabuza is a more experienced and darker - minded ninja compared to Naruto. By being with him, Naruto might start to see the grayer areas of the ninja world, not just the black - and - white view he had before.
His view of the world would expand. Naruto, who was mainly focused on the ninja world, would now be exposed to the magical world through Merlin. This would make him more open - minded and understanding of different cultures and powers. He may also start to use his newfound knowledge to try and bring peace not just between ninja villages, but also between the ninja world and the magical realm Merlin comes from.
His understanding of the ninja world would expand. He might become more cautious and calculating in battles, as Kaguya's training could expose him to different strategies. Also, he could develop a more solemn side to his personality, considering Kaguya's own complex nature and the heavy knowledge she might share.
His understanding of the ninja way would expand. The Sandaime could share his own experiences and wisdom, making Naruto more in - tune with the deeper meaning of being a ninja. He might also become more confident, knowing he has the backing and training of such an important figure.
His understanding of the Uchiha and the darker side of the ninja world would deepen. Itachi would share his experiences, and Naruto would gain a more nuanced view. This might make him more empathetic towards enemies. Also, his combat skills would diversify. He could incorporate Itachi - like precision and speed into his fighting style, becoming a more well - rounded ninja.