Well, apart from Naruto, the jinchuriki of the Ten - Tails in the original Naruto series, Obito, could be a main character in the crossover fanfiction. His connection to the Ten - Tails and his past actions in the Naruto story could be explored further in the crossover. And of course, the Sage of Six Paths, who has a deep connection to the Ten - Tails, might also make an appearance and be a crucial character in the fanfiction.
In addition to Naruto, other characters like Sasuke could also be main characters in this type of fanfiction. Sasuke has always had a complex relationship with Naruto and the power of the Ten - Tails could bring new challenges and opportunities for their relationship. Also, characters like Kakashi who are important in Naruto's life might also play significant roles.
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.
Obviously, Naruto himself would be the main character. Since it's about him growing tails, he's at the center of it all. The Nine - Tails would also play a crucial role. It's the source of his tail growth. And his friends like Sasuke and Sakura are likely to be important too. They'll probably be involved in Naruto's journey and how he deals with his new situation.
Naruto himself is often a main character. Since he has a strong connection to the tailed beasts in the original series, in fanfiction involving the Ten Tails, he is usually at the center of the action, trying to either defeat it or understand it better.
Obviously Naruto would be one of the main characters. Since it's a Naruto - based crossover, he's the central figure from the Naruto universe. And then there could be a god or gods. It could be a well - known god from a particular mythology, like Zeus from Greek mythology. He would bring his own set of powers and personality to the story.
Sasuke would be a likely ally. They have a long - standing relationship and have fought side by side before. Sasuke's Sharingan and his own unique abilities would be a great asset against the Ten - Tails.
Obviously Naruto would be one of the main characters. Since it's related to the Juubi, Sasuke could also play a major role. They've always been connected to the main threats in the Naruto universe. And if it's a crossover, maybe some characters from other popular anime could be involved, like Goku from Dragon Ball. He's super powerful and his presence could add an interesting dynamic to the story.
It could be a young and talented ninja who has a special connection to the Ten - Tails. Maybe he's the descendant of an ancient clan that was involved with the Ten - Tails in the past.
Sonic is very likely to be involved. Since Sonic and Tails are close friends, Sonic would surely try to rescue Tails from Shadow. He would be the hero of the story, using his speed and wits to face off against Shadow.
In certain fanfiction, Naruto is indeed the Ten - Tails. This could be a really cool concept as it combines Naruto's already powerful nature with the ultimate power of the Ten - Tails. It might lead to stories where Naruto has to struggle with the dark side of such power, or he could use it to bring about a new era of peace in the ninja world. Maybe he would have to face off against old enemies who are now even more afraid of his new - found strength.
Even Hinata could potentially be written as a betrayer in some really out - there fanfictions. Maybe in a crossover where there are mind - control elements, Hinata could be forced to turn against Naruto. But this would be a very different take on her character as she's usually portrayed as extremely loyal to Naruto.