Zabuza could be portrayed as more of a mentor figure. Instead of just being a ruthless assassin, he could be shown guiding Naruto in some aspects of combat or strategy. Maybe he survived his encounter with Kakashi and had a change of heart, and now he imparts his knowledge to Naruto who is now a sensei himself.
Zabuza could be quite cold to Naruto at the beginning. He's not exactly the warm - and - fuzzy type. But when Naruto shows his skills and tells his story of being banished unjustly, Zabuza might empathize on some level. He might not show it openly, but he could start to protect Naruto in his own way, perhaps because he sees a bit of his younger self in Naruto who was also wronged by the ninja system.
In the Battle Through the Heavens, Qing Lin's final strength was at the Dou Zong class.
Qing Lin was an original character in the novel. She was a servant girl of the Desert Metal Mercenary Company. She had the physique of a snake person and a magical beast symbiotic. She could subdue the Ancient Heavenly Snake with the Triple Jade-Green Snake Flower Pupils. She was brought to the Central Plains by the Northern Protector of the 'Sky Serpent Mansion' Lu Man. She was sold to the Thousand Gold Association for auction. After which, she was bought by Xiao Yan for 37 million gold coins and became Xiao Yan's servant girl. With Xiao Yan's help, Qing Lin's strength continued to rise until she finally reached the Dou Zong class.
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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.
On a more practical level, Naruto's skills might be misused. Instead of using his power to protect Konoha and the people he cares about, he's using it for Zabuza's self - centered motives. This could also make him a target for other ninja who oppose Zabuza. So not only is he in danger from the people he used to call friends, but also from new enemies. And if he ever tries to break free from Zabuza, he might face severe retaliation from Zabuza himself, which could be life - threatening.
A minor character like a blacksmith's apprentice could find Zabuza's sword. Instead of using it for fighting, they study it closely. They discover a unique metal alloy in the sword that they use to create new and improved weapons for their village. This not only changes their own fate as they become a renowned blacksmith, but also the fate of the village as they now have better weapons to defend themselves.
Well, Naruto is a very impressionable character. His idolization of Zabuza might make him more open to using unorthodox or morally grey techniques. He could start to question the black - and - white view of good and evil that he initially had. Maybe he would see the value in Zabuza's loyalty to Haku, which could in turn strengthen Naruto's own bonds with his friends.
Well, it could be due to some sort of mind - control jutsu. Maybe Zabuza uses a special technique that he learned in the Hidden Mist Village to make Naruto do his bidding.
One possible consequence could be that Naruto gains a new and powerful weapon. This sword might have unique abilities that could enhance his combat skills. He could use it to intimidate his enemies or as a last - resort weapon when his regular jutsu are ineffective.