One common plot twist is Naruto changing the fate of certain characters who died in the original story. For example, he might save someone like Jiraiya from his encounter with Pain. Another could be Naruto influencing the political situation in the Hidden Leaf much earlier, perhaps preventing the Uchiha massacre by getting to the root of the problem between the Uchiha and the village leadership. Also, he could change the way ninja training is conducted in the past, leading to a stronger Hidden Leaf in the present he left.
Often, in Naruto back to the past fanfiction, a plot twist involves the Akatsuki. Naruto could go back and try to stop the formation of the Akatsuki. He might change the events that led to the recruitment of members like Itachi or Nagato. This would have a huge impact on the overall story. Also, Naruto could find out that there was a bigger mastermind behind the Akatsuki all along that was never known in the original story. His interference in the past could expose this and change the future of the ninja world for the better.
One interesting plot twist could be Naruto having the knowledge of future events and using it to prevent certain tragedies. For example, he might stop the Uchiha massacre by revealing the truth about Itachi's situation earlier. Another could be Naruto changing the way he approaches his training, leading to him achieving new forms of power much quicker.
One possible plot twist could be Naruto changing the past in a way that completely alters the future relationships. For example, if he prevents a certain event that led to a character's death, it could change the whole dynamic among the characters. Another twist could be that Naruto discovers that the past is not as simple as he thought, and there are hidden forces at work that he didn't know about in his original timeline.
A plot twist could also be that the drugs are not what they seem at first. Maybe they are actually a key to unlocking a new power, but with a dangerous side effect. So, the Naruto characters have to decide whether to use this power source or not. In some fanfictions, the drug lord might be working with a bigger, more dangerous enemy that Naruto and his team don't know about until later in the story, which completely changes the scope and danger level of their mission.
A plot twist might be that Naruto's family abandonment was part of a prophecy. In the fanfiction, it could be that in order for Naruto to fulfill a certain destiny, he had to be abandoned so that he could grow in a specific way. Also, there could be a plot twist where the person Naruto thought was his enemy all along was actually the one who knew the truth about his family and was trying to guide him back to them in a roundabout way.
One common plot twist is the discovery of a new and powerful ninjutsu that changes the power dynamics. For example, Naruto might find a long - lost ninjutsu that gives him an edge over his enemies. Another twist could be a character turning out to be a traitor. Maybe someone Naruto trusted all along is actually working for the enemy. And sometimes, there's a twist where a character's ninjutsu has an unexpected side effect that they have to deal with.
One possible plot twist could be that Naruto's love for Kakashi from the past disrupts the timeline. Maybe his feelings cause him to unknowingly change events that were supposed to happen. For example, he might prevent Kakashi from making a certain decision that was crucial in the original timeline.
One common plot twist could be that the female Naruto discovers she has a hidden power that was dormant in her original timeline but is awakened in the past. For example, she might find out she has a special connection to an ancient jutsu or a long - lost clan. Another plot twist could be that her actions in the past change the future in unexpected ways. Maybe she accidentally prevents the birth of one of her important friends in the original timeline. Or perhaps she gets caught up in a political intrigue that was not part of her original story and has to navigate through it carefully to ensure she can still return to her own time and that the future she knows is not completely altered.
Another twist might be Naruto going back to the time when the Nine - Tails attacked Konoha. He could potentially find a way to stop the attack or at least lessen the destruction. Maybe he could even change how the village views the Nine - Tails and those who are jinchuriki. For example, instead of fearing and ostracizing them, they could start to understand and accept them earlier.
One common plot twist could be the OC initially not realizing their connection to Hashirama. For example, they might have strange dreams or abilities that they can't explain. Another twist could be that the OC is hunted by those who fear the power of Hashirama being reborn. They might face enemies from all sides, even some who were once allies of Hashirama. And sometimes, there could be a plot twist where the OC's reincarnation is part of a larger prophecy that not only involves the ninja world but also other hidden dimensions or powers.
One common plot twist is that Haku's true identity is related to Naruto's family in a more complex way than just being siblings. Maybe they are part of a long - lost clan. Another is that their combined powers lead to a new and unexpected ability that changes the course of the Naruto world. For example, they might be able to combine their ice and wind - based techniques in a unique way.