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.
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.
One possible plot could be Naruto learning Zabuza's unique water jutsu techniques. For example, he might master the Hidden Mist Jutsu which Zabuza was famous for. This would give Naruto an edge in combat, especially in stealthy attacks.
One possible plot could be that Naruto, under Zabuza's training, learns new and unique water - style jutsu. Zabuza, being a master of silent killing, could teach Naruto stealth techniques. Naruto might also gain a different perspective on the shinobi world from Zabuza, who has a more ruthless view compared to his usual teachers. This could lead to internal conflicts within Naruto as he tries to balance his own values with the new knowledge.
In this fanfiction, Naruto might gain some unique and deadly water - style techniques from Zabuza. Zabuza is a master of assassination and water - style jutsu. So Naruto could become more stealthy and proficient in close - combat water attacks. He may also learn about the darker side of the ninja world from Zabuza, which could make him more cynical or more understanding of the different kinds of shinobi out there.
One possible plot twist could be that Zabuza's training methods lead Naruto to develop a darker side. Naruto might start to question his own values as Zabuza's more ruthless ways of fighting seep into his mindset. For example, he could become more willing to use underhanded tactics in battles, which would shock his friends.
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.
Naruto might also develop a more ruthless edge to his fighting. Zabuza was a cold - blooded killer in a way. While Naruto wouldn't become evil, he could be more decisive in combat, not hesitating as much when it comes to taking down opponents. He may also learn some of Zabuza's sword - fighting skills, adding a new dimension to his fighting style if he combines it with his kunai and shuriken use.
With Sakura, Naruto's attitude could shift. Instead of being the goofy, love - stricken Naruto she's used to, he could become more distant. He might be so focused on his training with Zabuza that he doesn't have time for Sakura's attempts to get his attention. This could make Sakura feel rejected and lead to some tension between them.