One interesting plot idea could be Naruto having to form a special bond with each tailed beast separately. For example, he might start with the One - Tailed Shukaku and have to understand its past and the pain it has endured. This could involve him entering the tailed beast's mind - scape and facing its inner demons. Another idea is that all the tailed beasts decide to test Naruto's worthiness as the Jinchuriki of the Nine - Tails. They could create various challenges for him, both physical and mental, to see if he can truly handle the power of all the tailed beasts combined. A third plot could be that an ancient evil threatens the world, and only by uniting all the tailed beasts and their powers, with Naruto as the leader, can they defeat it.
One idea could be that the female tailed beasts team up with Naruto to protect the Hidden Leaf from a new and powerful enemy. They use their unique powers in combination with Naruto's skills to create some really cool battle scenes.
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.
One plot idea could be that the female tailed beasts are initially distrustful of Naruto. But as they interact more, they discover his pure heart. For example, the Two - Tails might be constantly on edge around Naruto at first. Then Naruto saves her from a powerful enemy, and she starts to respect him. Another idea is a love triangle between Naruto and two of the fem tailed beasts, like the Five - Tails and the Eight - Tails. This could create a lot of drama and tension in the story.
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.
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.
In this fanfiction, Naruto could control all the tailed beasts because of his unique chakra nature. His chakra is very special and has a high compatibility with the tailed beasts' chakra. Also, his experiences with Kurama might have given him insights on how to handle other tailed beasts. He probably communicates with them on a spiritual level and convinces them to work together with him.
Well, in many fanfictions, Naruto might use his strong will and the power of his Uzumaki heritage. His natural chakra reserves are huge, which helps. He also has a deep understanding of friendship and the tailed beasts' pain from his own experiences. So, he can connect with them on an emotional level and gradually gain their trust, thus being able to control them.
One interesting plot idea could be that Naruto has to find a new way to bond with the Ten - Tailed Fox. Maybe the fox's power starts to go out of control and Naruto has to enter its mind - scape to calm it down. Another idea is that an enemy tries to steal the Ten - Tailed Fox from Naruto and he has to fight to keep it.
Another plotline might involve the tailed beasts teaming up in a way that was unexpected. Say, all the tailed beasts decide to break free from their jinchuriki hosts at the same time and form their own alliance. This would create a huge shift in the power balance in the Naruto universe and force the ninja villages to reevaluate their relationships with the tailed beasts.
Well, in such a fanfiction, the reader having all the tailed beasts could lead to a really complex plot. First, they would have to deal with the internal struggle of controlling such immense power. Maybe they start as an outcast in the ninja world because people fear their power. But as time goes on, they learn to use the tailed beasts' powers for good. They could form alliances with different villages, using the power of the tailed beasts as a deterrent against common enemies. And they might also discover secrets about the origin of the tailed beasts that no one else knew, which could change the whole perception of the ninja world.