The plot could also involve the other characters' reactions to this evil version of Naruto from the future. Some might be confused, while others might immediately sense the danger. Naruto could also face challenges in changing the past as there could be unforeseen consequences or time - related ninja techniques that prevent him from fully achieving his evil goals.
The main antagonists could be the original Naruto's friends and allies. Since this is an evil Naruto, people like Sasuke, Sakura, and Kakashi would likely oppose him and try to stop him from whatever evil plans he has in the past.
One possible plot could be Anakin going back to a time before his fall to the dark side. He could use his knowledge of the future to prevent certain tragedies. For example, he might stop the Clone Wars from starting, thus saving countless lives. This would also give him a chance to redeem himself and perhaps even change the fate of the Jedi Order.
One popular plot twist could be Naruto preventing the Uchiha massacre. This would completely change the future as Sasuke's path of revenge would be derailed. It would also impact the relationship between the Uchiha and the rest of the village.
Well, it could be about Naruto being influenced by some dark force. Maybe he gets tired of the village's treatment and decides to go against it. He might use his powerful jutsu in a more menacing way than before.
Perhaps in this fanfiction, Damon goes back in time to a period in history that has always fascinated him. He could get involved in historical events and even fall in love with someone from that time. His actions in the past would then have unforeseen consequences when he returns to his own time, like new enemies or allies emerging because of what he did in the past.
In the 'kenichi goes back in time fanfiction', it might be that Kenichi goes back to a time when his martial arts dojo was first founded. He could then meet the founders and learn from them in a more direct way, and also influence their development of martial arts with his modern knowledge. This would create a loop of knowledge exchange between different time periods in the world of martial arts related to Kenichi.
One possible plot could be that Kagome goes back in time and tries to change a major event in the past. For example, she might try to prevent a big battle that had a lot of casualties. She could use her modern knowledge and skills to her advantage in the past, like using first - aid knowledge to save lives.
Perhaps Elsa goes back in time to meet her parents again. She could learn more about her powers from them, as they might have known more than she initially thought. This encounter could also give her a chance to say goodbye properly, which she didn't get the first time. And it could lead to her having a better understanding of her place in the kingdom and her family.
In a 'kaneki goes back in time fanfiction', perhaps Kaneki goes back to when he was still a normal college student. He then decides to study more about ghouls secretly. He could use this knowledge to try and find a way to co - exist peacefully between ghouls and humans from the very start. He might start by trying to change the views of some key people in the CCG, using his understanding of their future actions.
Well, one possible plot could be that Zuko goes back in time and tries to prevent the Fire Nation's aggression from the start. He could use his knowledge of the future to change things for the better, like trying to influence his father in a different way to avoid the war.