As the Ten - Tails Jinchuuriki in fanfiction, Naruto's character development could be quite complex. He would have to learn to control this new and overwhelming power. This would require a great deal of self - discipline. His sense of responsibility would also grow as he realizes the potential destruction his power could cause if misused. He might become more withdrawn at first, trying to figure out how to handle this new part of himself, but eventually, he would emerge as an even more reliable and powerful hero.
His character might become more isolated as he has to deal with the overwhelming power of the Ten - Tails. He would have to learn to control it on his own, which could make him seem distant to his friends.
In this fanfiction, Naruto as the Ten - Tails Jinchuuriki could change the entire power dynamic in the ninja world. Enemies that once thought they could easily defeat him would now be terrified. His new form might also give him unique abilities like instant teleportation or the power to create large - scale illusions. It could also lead to a new alliance among the villages as they see Naruto as an even greater force for good.
He might develop more self - reliance. Without relying on the power of the tailed beast, Naruto has to work harder on his own training. He could become more strategic in battles as he doesn't have the brute force of the jinchuuriki to fall back on.
If Naruto becomes the Ten - Tails Jinchuuriki in fanfiction, it would be a game - changer. Firstly, his physical strength would skyrocket. He could move at incredible speeds and deliver punches and kicks with devastating force. Secondly, his sensory abilities would be off the charts. He would be able to detect enemies from miles away. Thirdly, his ninjutsu would be on a whole new level. He could create massive and powerful jutsus with ease. However, he would also have to deal with the potential negative effects of containing such a powerful entity within him, like the risk of losing control. But knowing Naruto, he would find a way to master it and use it for good.
At first, Naruto might be confused and a bit scared of the tails growing. But as he realizes he can control them, he becomes more confident. He starts using the new power associated with the tails in battles, which makes him more respected among his peers. His understanding of his own body and chakra also deepens.
In this fanfiction, Naruto's character development would be complex. Growing up with a Jinchuuriki, he would have a deeper understanding of the power within. He might not be as loud and brash as in the original. Instead, he could be more of a silent observer at first. As he grows, he would gradually show his leadership skills in a different way. He would use his knowledge of the Jinchuuriki and their power to inspire others, and also be more diplomatic in dealing with different clans and villages, as he has seen the consequences of being an outcast through the Jinchuuriki's experience.
Another possibility is that the time - traveling Ten - Tails Jinchuuriki ends up in a time during a great war. Their presence could either end the war quickly if they side with one of the parties, or make it even more chaotic as all sides would either try to recruit or eliminate this powerful being. They might also have the power to change the outcome of certain battles and thus reshape the world's power balance.
His character could become more confident. With the power of the Juubi, Naruto would know he has the ability to protect his village and those he loves. He might also become more solitary at times as he tries to understand and control the new power within him. He would have to grow in terms of his wisdom to use the power responsibly.
If the Ten - Tails Jinchuuriki travels through time in Naruto, they could change the fates of many characters. For example, they might save characters who were supposed to die, like some of the Uchiha clan members. This would have a huge impact on Sasuke's story and the overall plot related to the Uchiha. It could also lead to different alliances forming as the power balance in the ninja world shifts due to the presence of this extremely powerful being.
One interesting plot point could be the reaction of the other Jinchuuriki. Since Naruto now has the power of all the Tailed Beasts combined, the other former Jinchuuriki like Gaara might have mixed feelings. They could be both in awe of Naruto's new power and a bit envious at the same time.