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.
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.
It's really hard to say. Naruto has a lot of powerful jutsu and great combat experience. But Kuyo has vampiric powers which can be very dangerous. If Naruto can get in close and land a powerful Rasengan, he might win. However, Kuyo could use his speed and fangs to counter. It really depends on the situation and how the writer wants the story to go.
Well, competition is really prevalent. It could be a race, a battle of wits, or a test of strength. There's also the exploration of their individual strengths and weaknesses. In some fanfictions, Sonic's overconfidence is his downfall while Tails' intelligence helps him. Also, the theme of self - discovery can be there. They might learn something new about themselves during their rivalry.
One popular Sonic vs Tails fanfiction is 'The Rivalry Renewed'. It shows an intense competition between Sonic and Tails in a race through a new, dangerous zone. Another is 'Sonic and Tails: Clash of Ideals' which delves into their different approaches to handling a threat in Mobius. There's also 'Tails' Triumph over Sonic' which has an interesting plot where Tails outsmarts Sonic in a series of challenges.
Well, in a fanfiction where Naruto becomes the zero tails, it could open up a whole new world of storytelling. The zero tails has a mysterious origin and nature. Naruto's transformation into it could mean a shift in the power balance in the Naruto universe. His relationships with other characters like Sasuke and Sakura would also be affected. For example, they might be initially afraid or suspicious of his new form. And Naruto himself would need to learn how to use the zero - tails' power for good, perhaps by finding a way to combine it with his existing values and ninja skills.
In RWBY fanfiction, the Weiss vs Winter fight can be a display of their different combat styles. Weiss is more about grace and precision with her Glyphs, while Winter, being more experienced, has a more refined and perhaps harsher style. Their fight could also explore their complex relationship as sisters.
One plot could be that Sakura is experimented on by some evil force and they accidentally turn her into a form related to the Ten - Tails. She then has to struggle with her new identity and powers. She might initially be feared by her friends, but as she learns to control her new abilities, she uses them to fight against the real threat that created her situation in the first place.