Maybe a fanfic where a villain tries to conquer the tailed beasts in a completely new way. Instead of using brute force, they use a powerful genjutsu to trick the beasts into following them. The hero then has to figure out how to break the genjutsu and save the beasts. It would involve a lot of mystery and mind - games.
One plot idea could be a young and inexperienced ninja discovers they have a unique connection to the tailed beasts that no one else has. For example, they can communicate with the beasts on a deeper level, not just the usual 'host' relationship. This could lead to them trying to unite the tailed beasts in a peaceful way, against all odds and the mistrust of the different ninja villages.
Another interesting plot could be a group of outcast ninjas who are shunned by their villages because they are seen as too dangerous due to their connection with the tailed beasts' power. They form their own group and decide to take control of their own destinies by taming the tailed beasts in a way that benefits the world as a whole, rather than being used as weapons.
A plot could revolve around a tailed beast that has been corrupted by an unknown force. Naruto and his friends then have to find a way to purify the beast without killing it. This would require them to understand the nature of the tailed beasts more deeply. In the process, they might discover new secrets about the tailed beasts' origins and their connection to the ninja world. It could also lead to new alliances and enemies. There could be intense battles and emotional moments as they try to save the corrupted tailed beast.
One idea could be exploring the ten - tailed beast's origin in more depth. Maybe it has a hidden past or a connection to an ancient civilization that has been long forgotten in the Naruto universe.
A possible plot could involve Naruto being able to enter the minds of the tailed beasts more freely and vividly. In this state, he experiences their memories as if they were his own. He witnesses the creation of the tailed beasts, the wars they were involved in, and the pain they've endured. This newfound understanding makes him determined to create a new world where the tailed beasts are not feared but respected. So he starts a movement among the ninja villages, using his influence and the power of his bond with the tailed beasts to change people's perceptions.
One idea could be the discovery of an 11th tailed beast that has been hidden away for centuries. The main characters in Naruto then have to figure out how to deal with this new and powerful entity. Maybe it has a unique ability that disrupts the existing balance of chakra in the ninja world.
You could write a tailed beast fanfiction where the tailed beasts are reincarnated as humans. They start to remember their past lives as tailed beasts slowly. This would lead to a lot of internal conflict as they try to figure out who they are now. They might also have to deal with the fact that they still have some of their tailed beast powers, which could attract unwanted attention from various groups in the world of the story.
Maybe in the fanfiction, Naruto as a tailed beast has the ability to transform into different elements related to his tailed beast nature. For instance, if he has a fire - related tailed beast form, he could turn into a blazing phoenix made of pure fire. This would give him new combat abilities and make his battles more epic. And his friends would have to learn how to fight alongside him in this new form. His training would also be different. Instead of normal ninja training, he would be learning how to control his tailed beast instincts and use his new powers for good.
One idea could be that Naruto discovers a new ancient power source that fuses with his existing chakra, gradually transforming him into an 11 - tailed beast. This new form could give him abilities beyond what we've seen in the original series, like the power to manipulate time on a small scale. Maybe he uses this new power to go back in time and prevent some of the tragedies that occurred in the Naruto world.
Another interesting concept could be a 'Naruto Conquest Fanfiction' set in an alternate timeline. In this timeline, Orochimaru successfully takes over Konoha early on. The story could follow a group of young ninjas who rise up against Orochimaru's tyranny and in the process, they start to conquer the areas that Orochimaru has corrupted, bringing back the true spirit of the ninja world.
It could be an original character. For instance, a young girl from a small, forgotten ninja clan who has a natural affinity for the tailed beasts. Maybe she has a special kekkei genkai that allows her to sense their emotions from afar, and she embarks on a journey to conquer the tailed beasts to prove her clan's worth.
One interesting plot could be the exploration of the power dynamics when the 10 - tailed beast interacts with different ninja clans. Maybe it shows how they try to either control it or form alliances with those who can.