The other Jinchuurikis could be potential allies. They understand the struggles and the power that comes with having a tailed beast inside them. For example, Killer Bee, who has a good relationship with his tailed beast, could share his insights on how to better co - exist with Shukaku. Tsunade might also be an ally, as she is a powerful Hokage who could offer protection and resources to the Jinchuuriki.
One idea could be exploring the relationship between the Jinchuuriki and Shukaku in more depth. Maybe the Jinchuuriki tries to communicate with Shukaku in a different way than in the original series, leading to new powers or understandings. Another plot could involve the Jinchuuriki being targeted by a new group who wants to use Shukaku's power for their own evil purposes. The Jinchuuriki then has to fight not only to protect themselves but also to keep Shukaku from being misused.
Obviously Naruto would be the main character. Shukaku itself or a representation of Shukaku's spirit could be there. Also, characters like Iruka sensei would still be around. His friends like Sasuke and Sakura would play important roles as they react to Naruto's new situation.
Maybe Danzo. He's always been a power - hungry character. In a story where Naruto doesn't have the jinchuuriki advantage, Danzo could see it as an opportunity to take over the village without the threat of Naruto's special power standing in his way.
In this fanfiction, Naruto Jinchuuriki might have god - like powers such as extreme strength. They could potentially have the ability to control nature on a large scale, like summoning massive storms or earthquakes. Their physical endurance might be enhanced to the point where they can withstand attacks that would normally be fatal.
One of the popular ones is probably Kushina, Naruto's mother. Since she was a jinchuuriki herself, she often appears in these fanfictions in the harem. Another could be Fu from Takigakure.
Well, it could be about Naruto having the powers of Shukaku in addition to his own. Maybe he has to learn to control this new power source and face new enemies who are after his unique abilities.
Perhaps the story shows Naruto exploring different aspects of the ninja world that are not related to jinchuuriki. He could be delving into ancient ninja techniques or solving mysteries that have nothing to do with the tailed beasts inside him. It might also highlight his relationships with other characters in a new light, like his rivalry with Sasuke in a non - jinchuuriki - related context.
I would recommend 'Naruto and Shukaku: A New Alliance'. In this fanfiction, it focuses on a scenario where Naruto and Shukaku have to team up against a new, powerful enemy. It has a lot of action scenes and also some really interesting character development for both of them.
There could be a powerful and jealous ninja from another village. This ninja wants the power of the Shukaku for himself. He sees the relationship between Naruto and the female Shukaku as an obstacle to his goal, so he devises plans to separate them and capture the female Shukaku, making him a major antagonist in the fanfiction.
The Jinchuuriki's mentors or those who protect them could also be main characters. For instance, Kakashi could be a main character in a fanfiction where he is tasked with training a new Jinchuuriki. His experience and wisdom would play a crucial role in the Jinchuuriki's development, and his interactions with the other characters in the village would add depth to the story.