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.
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.
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.
Well, perhaps it could be about Sakura being physically restrained by Black Zetsu. She might be struggling to break free in order to save her friends or stop some evil plan that Black Zetsu is part of.
It could be that in this fanfiction, Black Zetsu ties up Sakura as a way to stop her from interfering with his greater plans. Since Sakura is a strong and capable ninja, immobilizing her in this way gives Black Zetsu an advantage. He might be trying to use her as a bait to lure in other characters, like Naruto or Sasuke, into a trap.
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.
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.
Naruto could be the one to save her. He has a strong bond with Sakura and would never let her be in danger for long. His powerful ninja skills and his unwavering determination would make him a likely candidate to rescue her from Black Zetsu's grip.