One challenge could be controlling his newfound power. The Juubi's power is immense and Naruto might struggle to not accidentally cause destruction while time - traveling. For instance, a simple movement or action might have a much larger impact on the timeline due to his increased power.
Well, it could have a huge impact. Maybe his new power as the Juubi gives him the ability to control time in some way during the time - travel. For example, he might be able to reverse or speed up certain events more easily than he could without that power.
Well, if Naruto becomes the Juubi in a time - travel fanfiction, one possibility is that he could use his new - found power to change the course of history. Maybe he'd prevent some of the great tragedies that happened in the Naruto world. He could also use the Juubi's power to gain a deeper understanding of the chakra system and teach others about it, leading to a new era of ninja development.
One challenge could be controlling the power of the Juubi. It's an incredibly powerful and chaotic force. Naruto would have to struggle to keep it in check so that it doesn't overwhelm him and cause him to lose control. If he loses control, he could end up harming his friends and allies instead of protecting them.
Another interesting idea in this type of fanfiction is the character interactions. Naruto could interact with his parents when they were young. He could see how his father was as a young ninja, and how his mother was before she sacrificed herself. This would give him a deeper understanding of his family and his own identity. And with the Juubi's presence, these interactions could take on a whole new level of significance, as he might be able to use the Juubi's power to protect his family in the past, changing the course of his own family's history.
One possible challenge is controlling the immense power. The Juubi's power is so vast that it could be difficult for Naruto to keep it in check. Another challenge might be how others perceive him. People could fear him and try to isolate him.
In Juubi Naruto time travel fanfiction, plot twists can be really exciting. For instance, Naruto might find out that the Juubi has a different origin in the past than what he thought. This could completely change his perception of the tailed beasts and his role as the Jinchuriki. It could lead to him having to form new alliances or fight new enemies in the past.
His character could become more isolated at first. The power of the Juubi is so great that it might be hard for others to understand him. But as he learns to control it, he could become more confident and wise. He would have to face new moral dilemmas as well, like how much power is too much and when to use it. This would lead to a more complex and mature Naruto.
Another plotline could involve a villain traveling back in time to use the Juubi's power in a different era. They could manipulate events to their advantage, like changing the outcome of important battles or influencing key characters to side with them. This would force the heroes to also time - travel to stop the villain's plan.
Maybe through some sort of ancient ritual. In the Naruto universe, there are often powerful and mysterious rituals. It could be that Naruto discovers an old scroll or is guided by a sage to perform a ritual that allows him to bond with the Juubi.
In this kind of fanfiction, Naruto becoming the Juubi would completely change the Naruto universe. It would mean he has an insane amount of power. He could potentially reshape the world, bring peace in a way no one expected. His relationships with other characters like Sasuke would also be very different. Sasuke might be both in awe and a bit jealous of this new power Naruto has.