Sakura could be a great protagonist. She's already a strong character in the Naruto universe, and if she were to somehow be involved with the Juubi eye in a crossover, it would be interesting to see how she'd handle the new power. Maybe she could use it to enhance her medical ninjutsu in ways never seen before.
One possible interesting plot could be a crossover where a character from another universe gains the Juubi eye in the Naruto world. This new power could disrupt the balance of power, leading to alliances and rivalries being formed in new and unexpected ways.
One possible scenario in this fanfiction could be that Naruto gains the Juubi Ten - Tails Eye and his power skyrockets. He might use this newfound power to protect the Hidden Leaf Village from even greater threats. Maybe he could even use it to bring about a new era of peace in the ninja world, as his already strong will and determination would be enhanced by the power of the eye.
The Juubi eye could potentially be a key factor in the time travel plot. It might possess powers that allow the user to manipulate time or access different timelines. For example, it could open portals to the past or future. This would create interesting scenarios where Naruto has to use the Juubi eye's power to correct past mistakes or prevent future disasters.
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.
Naruto would likely be one of the main characters. Since it's a Naruto - centered fanfiction, he'd be the one using the Juubi eye for time travel, probably to save the world or his friends. Sasuke could also be involved. Maybe he initially opposes Naruto's use of the Juubi eye for time travel but later realizes its importance. And there could be villains like Kaguya who might try to stop Naruto from using the Juubi eye's time - travel powers for their own evil purposes.
In fanfiction, if Naruto had the Juubi Eye, he would likely become extremely powerful. His already formidable combat abilities would be enhanced to a new level. He might gain new jutsu or have an even greater control over chakra. This could potentially change the entire Naruto universe's power balance, making him nearly unbeatable against his foes.
Naruto becoming the Juubi in a crossover fanfiction could lead to new alliances. Other characters from different series might see him as a valuable ally or a threat. For instance, characters from Bleach might approach Naruto differently. And Naruto himself might have to decide who he can trust with his new power.
Well, it could be about Naruto having to face a new and more powerful form of the Juubi. Maybe the Juubi has some new abilities or is being controlled by a new villain. Naruto would then have to gather his friends and allies, train harder, and discover new powers within himself to defeat this new threat.
A common theme is the clash of different power systems. Naruto has his chakra and various jutsu, while Inuyasha has his demon powers. When the Juubi is added into the mix, it creates a complex power dynamic.