Another cool plot twist could be that the Ten Tails has the ability to split into multiple smaller entities, each with its own unique power. This would force Naruto and his friends to come up with new strategies to deal with these new threats. And it might also lead to some of these smaller entities turning good and helping Naruto in unexpected ways.
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.
Obviously, Naruto is often a main character. Since it's about the Ten - Tails in the Naruto universe, he's usually at the center of the story, whether he's trying to defeat it, control it, or understand it.
One interesting 'ten tails naruto fanfiction' story could be about Naruto taming the Ten - Tails in a completely different way than in the original series. Maybe he uses his unique bond with all the tailed beasts to communicate with it on a deeper level and convinces it to side with him without a fight.
Sasuke could also be a great main character for this kind of fanfic. His power and his complex relationship with Naruto could add a lot of depth. Maybe he discovers a new way to combat the Ten Tails that Naruto doesn't know about, and they have to work together in a new way.
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.
A great plot could be about a group of young ninjas who accidentally awaken the Ten Tails and then have to find a way to reseal it before it destroys everything. They could discover new jutsus and powers along the way. Also, what if the Ten Tails had a different form that was not known before, and the characters have to figure out how to deal with it.
In fanfiction, Sakura might have various interactions with the Ten - Tails. She could be involved in a battle against it, using her medical and combat skills. For example, she might heal the wounded while others fight the Ten - Tails directly. Or perhaps she discovers a unique way to weaken the Ten - Tails, like finding a chakra - based vulnerability that no one else had thought of before.
Well, Harry could use his magic to try and communicate with the Ten Tails. Since he has a connection to the magical world, he might be able to find a way to reach the Ten Tails' consciousness. Hermione, on the other hand, would probably study ancient magic texts to figure out more about it.
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.