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.
Well, it would drastically change the power balance. Naruto already had a strong connection with the Nine - Tails. Having 3 tailed beasts would make him an even more formidable force. His enemies would be much more cautious around him. He might also have to deal with the different personalities and powers of each tailed beast, which could be a challenge to control all at once.
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 would change a lot. Firstly, the village's perception of Naruto would be different. They might see him as an even greater asset or a greater threat, depending on how they view the tailed beasts. Also, his training would be different. He'd have to learn to control two powerful entities inside him, which could be a whole new level of difficulty compared to just one. And in battles, he could potentially use the two tailed beasts to double - team opponents or combine their abilities for a super - powerful attack.
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.
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.
The abilities would be numerous. Naruto could gain the power of enhanced perception from one of the tailed beasts, being able to sense enemies from much greater distances. Another tailed beast might give him the ability to manipulate earth, allowing him to create earthquakes or form defensive earth structures. And with the combined power of three tailed beasts, he could potentially break through any type of chakra - based defense. His stamina would also be greatly increased, enabling him to fight for longer periods without getting tired.
The relationships can be developed through shared battles. When Naruto and the fem tailed beasts fight side by side against common enemies, they can start to trust each other more. For instance, if they face a powerful rogue ninja together, they'll learn about each other's combat styles and strengths.