In a 'naruto ganbanged kyuubi fanfic', Naruto's interaction with the Kyuubi would be multi - faceted. At first, the Kyuubi might be resistant to Naruto's attempts to fully understand it. But as Naruto shows respect and determination, they start to work together more closely. The other characters in the village, such as Kakashi, would be both worried and curious about this new relationship. They might try to monitor Naruto's progress, fearing that he could lose control of the Kyuubi, but also hoping that he can harness its power for the good of the village. Meanwhile, Naruto's friends like Sakura would be supportive, yet also a bit in awe of the changes in Naruto due to his connection with the Kyuubi.
The interactions in a 'naruto ganbanged kyuubi fanfic' would be very interesting. Naruto, being the main character, would constantly be in a state of communication with the Kyuubi. This could be in the form of mental battles at times, where Naruto has to assert his will over the Kyuubi's more primal instincts. Other characters would react differently. The older generation of ninjas, like the Third Hokage, would be cautious and would likely give Naruto advice on how to handle this relationship. The younger ninjas, like Naruto's peers, would be amazed and might look up to Naruto even more. Some might even try to learn from Naruto how to form such a deep connection with a powerful entity like the Kyuubi, while others might be envious of the power it gives Naruto.
A 'naruto ganbanged kyuubi fanfic' could potentially be about Naruto and the Nine - Tails (Kyuubi) forming an unexpected and deep bond. Maybe Naruto discovers new powers within the Kyuubi that no one else knew about, and they work together to face new threats in the ninja world. This could involve Naruto learning to control the Kyuubi's power in a more refined way and using it to protect his village in unique ways.
Naruto would likely be curious about the magic in Fairy Tail. He might try to learn some spells. The Kyuubi, on the other hand, could be a source of fear for some of the Fairy Tail members at first. Natsu might see Naruto as a rival in terms of strength and want to have a friendly fight. Lucy would probably be intrigued by Naruto's story and the Kyuubi. She might offer to help him understand the Fairy Tail world better.
In a fanfiction, characters like Asami from Legend of Korra and Sasuke from Naruto could also interact. Asami might be intrigued by Sasuke's cool and brooding demeanor. Sasuke, in turn, could respect Asami's intelligence and engineering skills. Their interactions could add another layer of complexity to the story, as they come from very different backgrounds yet find common ground in their loyalty to their respective friends and the greater good.
The characters from RWBY could be initially afraid of the Kyuubi due to its powerful and somewhat menacing appearance. However, Naruto (if he also comes through with the Kyuubi) could act as a mediator, explaining the Kyuubi's power and how it can be used for good. For example, Weiss might be skeptical at first but then see the potential in combining her Dust powers with the Kyuubi's chakra.
Obviously, Naruto himself is a main character. He will be interacting with the Kyuubi. Since the Kyuubi is a powerful and sentient entity within Naruto, their interactions could be intense. Naruto might also encounter other ninja who have knowledge about the Kyuubi. For example, Jiraiya. Jiraiya, being Naruto's mentor, might appear to give advice on how to handle the situation with the Kyuubi. He could share some of his own research and experiences related to the tailed beasts.
The Kyuubi itself is also a popular character in these fanfics. Writers like to explore its personality, which might be different from how it was portrayed in the original. It could be more sentient, more emotional, or have its own goals and desires.
In many fanfictions, they interact on an emotional level. The fem furry Kyuubi might share her past traumas with Naruto, and Naruto, being the empathetic person he is, would offer support. This would create a bond between them.
Naruto would probably be very curious about the vampires and other creatures in Rosario Vampire. He'd be his usual friendly self, trying to make friends. The vampires might be initially wary of him, especially with the Kyuubi's power, but his positive attitude could win them over. Tsukune, from Rosario Vampire, could learn a lot from Naruto about determination and fighting spirit.
Obviously, Naruto is likely to be one of the main characters since it's about his Kyuubi cloak. He is the one who wields this power. Sasuke might also be a main character as he often has interactions with Naruto and his new power would surely affect their relationship. Sakura could be in there too, as she is part of Naruto's team and would be involved in any battles or events related to Naruto's use of the Kyuubi cloak.
Obviously Naruto himself is a very popular character in 'naruto kyuubi child fanfic'. He is the main focus as the host of the Kyuubi. The Kyuubi is also quite popular as it is such a powerful and mysterious entity within Naruto. Then there's Iruka, Naruto's teacher. He often plays an important role in fanfics as he is one of the first people to show kindness to Naruto as a child. And Sakura might also be a popular character, as her relationship with Naruto can be explored in different ways in these fanfics, especially when Naruto is still a child dealing with the Kyuubi's influence.