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 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.
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.
In such a fanfiction, Naruto would likely be extremely powerful. With all the tailed beasts' chakra at his disposal, he could easily overpower most foes. He might be able to perform new and incredible jutsu that were previously unimaginable. For example, he could combine the unique abilities of each tailed beast to create a super - attack.
If Naruto gets all the tailed beasts in the fanfiction, it would change the power dynamics completely. He could use their unique abilities in combination. For example, the Shukaku's sand control along with the Nine - Tails' chakra. This would make him a force to be reckoned with not only in combat but also in terms of politics and diplomacy in the ninja world. Other villages might see him as a threat or as a new leader to follow. And his relationships with his friends and allies would also evolve, as they would have to adjust to this new, super - powerful Naruto.
In the 'naruto gets all the tailed beasts fanfic', Naruto's life would change completely. He would no longer be just an ordinary ninja with a lot of potential. Having all the tailed beasts within him means he has access to an unimaginable amount of power. He could potentially unlock new forms or abilities that are a combination of his own and those of the tailed beasts. This could make him a force to be reckoned with not only in his own village but across all the ninja villages. His relationships with his friends might also change. They might look at him with a new sense of awe and respect. And Naruto would have to learn to control this new - found power, which could be a huge challenge in itself. But if he manages it, he could reshape the ninja world in ways no one has ever imagined.
It could be the Akatsuki. Since Naruto has all the tailed beasts, they would see him as a major threat to their plans of collecting the tailed beasts for their own purposes.
Another way is through shared experiences. If they face a common enemy together, like an evil organization that wants to capture all tailed beasts, they would have to rely on each other. This would lead to deeper understanding and stronger relationships as they fight side by side and protect one another in the face of danger.
Naruto's relationship with the other villages would be transformed. Some villages might be afraid that he would use the power of all tailed beasts against them. However, villages like Iwagakure, which had a history of conflict with Konoha, could now see Naruto as a unifying force. The younger generation in all villages would probably idolize him more than ever, seeing him as a symbol of ultimate power and justice.