Often, the main character would be the Sage of Tailed Beasts. They would be the central figure driving the story forward. There could also be other important characters such as the jinchuriki of the tailed beasts. For example, if the story is about protecting the tailed beasts, the jinchuriki would play a crucial role. And of course, there could be antagonists, perhaps villains who want to capture the tailed beasts for their own evil purposes.
In a 'Sage of Tailed Beasts Fanfiction', the main characters could include not only the Sage but also the leaders of the ninja villages. Since the tailed beasts are a matter of great importance in the Naruto world, the Hokage or other village leaders would likely be involved. There might also be some mysterious characters who have knowledge about the ancient times when the tailed beasts were first created. These characters could add depth and mystery to the story as they might hold the keys to understanding the true nature of the tailed beasts and the Sage's role.
I'm not sure specifically as there could be many different takes on it. It might be about a character who has a special connection or power related to the tailed beasts, like being able to control them in unique ways or having some sort of prophetic knowledge about them.
In 'Naruto meets the tailed beasts fanfiction', Naruto is surely a main character. As for the tailed beasts, they are like co - protagonists. Naruto's relationship with each tailed beast, such as Kurama, will be explored. And there might also be other supporting characters from the Naruto universe, like Kakashi or Sakura, who could react to Naruto's new interactions with the tailed beasts.
Naruto is obviously one of the most popular characters. Since he has a strong connection to the tailed beasts in the original series, in fanfiction, he often takes on even more heroic and complex roles related to them.
Another possibility is that one of the tailed beasts could be the main character. Maybe it's the nine - tailed fox, for example. The story could be told from its perspective as it tries to understand its own origin and the role of the mother of the tailed beasts in its creation and existence. It could be a story of self - discovery for the tailed beast, with the mother being a key part of that discovery.
Kurama is often a very popular character. As the Nine - Tails, he has a long history with the main Naruto storyline and his complex relationship with Naruto makes him interesting in fanfiction. He has a lot of power and a fiery personality.
In many fanfictions, the tailed beasts' personalities are shaped by their experiences. The Five - Tailed Horse is usually depicted as noble and proud. It has a certain elegance in the way it behaves. The Six - Tailed Slug is more nurturing and gentle, perhaps because of its slug - like nature. The Seven - Tailed Horned Beetle is often seen as mysterious and a bit aloof. It keeps to itself and doesn't easily open up. When it comes to the relationship with Naruto, these personalities play a big role. For example, Naruto might have an easier time getting along with the more friendly - natured tailed beasts at first, while having to work harder to understand and befriend the more reserved ones.
Well, Naruto himself might still be a main character as he has a strong connection to the tailed beasts in the original series. He could be the one trying to understand and deal with the 10 - tailed beast in new ways.
The 9 - tailed fox itself can be considered a main character in a way. It has its own personality and motives within the fanfiction. It might not be a traditional character but it has a huge impact on the story. And then there could be an antagonist, perhaps someone who wants to steal the power of the 9 - tailed fox from Minato, which would make that person a key character as well.
It could be a new, powerful group that has emerged with the sole purpose of taking the tailed beasts from the reader. They might have some unique jutsu or technology that makes them a formidable foe. Maybe they are a group of rogue ninja from different villages who banded together out of envy for the reader's power.
One interesting storyline could be about the tailed beasts forming an alliance outside of the control of humans. They might work together to protect their own kind and the world in a different way than the shinobi. For example, they could create their own hidden land where all chakra - based creatures are welcome.