Black Zetsu's story in Naruto is quite the tale. He was an entity that had been around since ancient times. He had an in - depth knowledge of the ninja world's history and used this to his advantage. He was the driving force behind many of the conflicts in the Naruto series. For example, he caused a rift between Sasuke and Naruto at times. His true nature was only revealed towards the end of the series, which was a shock to many characters. He was a master of manipulation, using the desires and weaknesses of others to achieve his ultimate aim of bringing back Kaguya.
One key event was his deception of Madara. He made Madara think he was his ally while actually setting him up for Kaguya's revival. Another was his influence on Obito. He pushed Obito to do things that served his purpose. Also, his role in the Fourth Great Ninja War was significant as he was behind many of the unexpected turns in the war.
It's likely that Naruto's chakra control and power would develop in new and unexpected ways. Black Zetsu might introduce him to strange chakra - based abilities that are not part of the normal ninja training. This could give Naruto an edge in combat, but it also might make him a target. Since Black Zetsu has his own motives, Naruto could be dragged into some dangerous and complicated situations that he may not be fully prepared for.
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.
If Naruto has Black Zetsu in the fanfiction, it can change the power dynamics. Black Zetsu might try to use Naruto's power for its own ends. Maybe it convinces Naruto to use his power in a way that seems good at first but actually has hidden motives. This could lead to new alliances and enemies forming in the Naruto universe. For instance, some villages might see Naruto as a threat now that he's being influenced by Black Zetsu.
He may develop a more calculating side. Black Zetsu is all about manipulation. Naruto could start thinking several steps ahead in a more devious way. For example, he might start using people's weaknesses against them, which is completely against his original nature. This change in personality would likely cause a rift between him and his friends who know him as the always - honest and straightforward Naruto.
The important characters in Black Zetsu's story are numerous. Kaguya Otsutsuki is the most fundamental as Black Zetsu was born from her will. Madara Uchiha is a central figure as he was deceived by Black Zetsu. Madara thought he was working towards his own goals, but in reality, he was just a pawn in Black Zetsu's plan. Naruto Uzumaki and Sasuke Uchiha are vital as they were the ones who had to face Kaguya in the end. Their power and determination were what stopped Kaguya's resurrection from being a complete success. Additionally, characters like Obito Uchiha, who was involved in some of the events related to the Akatsuki, which Black Zetsu also had a hand in, are also related to Black Zetsu's story.
One idea could be that Naruto discovers Black Zetsu has been secretly influencing some of the village's decisions all along. Naruto then has to find a way to expose Black Zetsu's actions without causing chaos in the village. Another plot could involve Black Zetsu trying to manipulate Naruto's newfound power for its own evil purposes. Naruto has to resist and use his own willpower and the power of friendship to overcome it.
Black Zetsu was created by Kaguya Otsutsuki. His main goal was to revive Kaguya. He manipulated many events in the Naruto world, like using Madara Uchiha for his own ends. He was hidden in the shadows, causing chaos and influencing the actions of various characters to further his plan of bringing Kaguya back to life.