A really interesting plot twist could be in the area of Naruto's chakra nature. Zetsu has some strange abilities related to plants and the earth. So, Naruto, being raised by Zetsu, might develop a new type of chakra nature that combines his own wind nature with something more related to earth or plant - like. This would make his jutsu look very different. For example, his Rasengan could be infused with some kind of plant - based energy that not only causes damage but also has some sort of healing or growth - promoting effect on the surrounding area. And his relationships with other characters would be different too. Since he's been raised by Zetsu, he might be more of an enigma to his peers in the Hidden Leaf Village, and they might be more suspicious of him.
Naruto's character development would likely be more self - centered. Zetsu doesn't have the same sense of community as the Leaf Village. So Naruto might focus more on his own power and survival rather than on protecting others. He may also be more secretive about his abilities and intentions. He wouldn't have the same kind of open - heartedness that he developed growing up in the Leaf Village with friends like Sasuke and Sakura. He could be more like an anti - hero, not quite as evil as the Akatsuki but not the hero we expect either.
Well, one way could be in their physical abilities. Maybe in the fanfic, Naruto is shown to have some of Zetsu's stealthy movement skills, like being able to blend into the environment in a similar way. Another similarity could be in their connection to nature. Zetsu has a strong link to the plant - like aspects of nature, and Naruto's chakra might be shown to have a similar kind of connection in the fanfic.
In a fanfic where Naruto is trained by Zetsu, the story could take an interesting turn. Zetsu has knowledge of the Akatsuki and their secrets. Naruto could learn about the organization from the inside out. This knowledge could help him in his quest to bring peace. He might also gain some physical enhancements. Zetsu is quite durable in his own way, and Naruto could inherit some of that sturdiness. This would make him an even more formidable opponent in battles against strong foes like Pain or Madara.
The fanfic might explore new aspects of Naruto's character by comparing him to Zetsu. It could show different sides of Naruto that we haven't seen before, like his more devious or strategic side if he takes on some of Zetsu's traits. This exploration of character depth can be really engaging for readers.
Perhaps Naruto controls Zetsu to help him in battles. Zetsu could act as a distraction while Naruto sets up his more powerful jutsu. For example, Zetsu could split into multiple forms and confuse the opponents, giving Naruto an opening to attack.
Zetsu could be a mysterious informant in a Naruto fanfic. He could be lurking in the shadows, gathering information for either the good guys or the bad guys and providing crucial intelligence that changes the course of events in the story.
Sasuke would be a likely character to interact. Given their complex relationship throughout the Naruto series, Sasuke might be suspicious or intrigued by Naruto's control over Zetsu. Their interactions could range from confrontations to reluctant teamwork.
Zetsu's ability to split into two parts can be used to create interesting plot devices. For example, one part of Zetsu could be captured by the protagonists, while the other part goes on to execute a different part of the villain's plan.