In the 'naruto gets all the tailed beasts fanfic', the main antagonists could vary. The Akatsuki is a likely candidate as they were always after the tailed beasts. But it could also be rogue ninjas who want to steal the power of the tailed beasts from Naruto for themselves. There might also be a group of power - hungry individuals from within Naruto's own village who feel that he is too powerful and needs to be stopped. They could form an underground group to oppose Naruto and try to take away his power. Another possibility is that there are other forces from outside the ninja world that see Naruto's power as a threat to their existence and plan to invade and take over the ninja world while Naruto is still learning to control his new abilities.
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.
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.
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 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.
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.
It could be Orochimaru. He is always interested in powerful forces and might see Naruto's release of the Nine - Tailed Fox as an opportunity to gain that power for himself.
It could be the very people who banished Naruto in the first place. They might fear his new - found power and try to stop him from returning to the village or from getting revenge. They would likely use underhanded tactics to try and take him down.
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.