The 'naruto is the second kyuubi fanfiction' likely delves into the idea that Naruto has a unique relationship with the Kyuubi that makes him be regarded as the second Kyuubi. This could lead to a whole new set of storylines. It could explore Naruto's training in the context of this new identity. He might need to learn to control new powers or abilities related to being the second Kyuubi. Also, it could show the political and social implications within the ninja world. Villages might be more afraid of him or try to use him for their own purposes. And it could also touch on the origin of this 'second Kyuubi' concept, like if there was some ancient prophecy or some secret experiment that led to Naruto being in this position.
In the 'naruto is the second kyuubi fanfiction', Naruto is the main character without a doubt. His story as the second Kyuubi is the focus. However, other characters from the Naruto series are also likely to play important roles. For instance, Kakashi, his teacher, could be involved in helping Naruto understand and control his new powers related to being the second Kyuubi. Jiraiya, too, might have some knowledge or prophecy about Naruto's situation and guide him. And characters from other villages like Gaara, who also has a connection with a tailed beast, could interact with Naruto in a new way in the context of this fanfiction. The Kyuubi, whether in its sealed form within Naruto or in some other manifestation, would be a key character as well, as it is the basis for Naruto's new identity.
Yes, in some fanfictions, Naruto is often depicted as the Kyuubi or having a very close connection to it. This can lead to really interesting and unique storylines that deviate from the original plot.
One common plotline is the Kyuubi teaching Naruto new and powerful jutsu. Since the Kyuubi has a vast amount of chakra and knowledge, it could share unique techniques with Naruto that are not part of the regular ninja training. Another plotline could be the Kyuubi's influence on Naruto's relationships. For example, some fanfictions explore how Naruto's connection with the Kyuubi affects how his friends and villagers perceive him. It can also lead to some interesting character development as Naruto has to learn to control the Kyuubi's power without being consumed by it.
In many Naruto fanfictions, Naruto might have developed some new and unique abilities that the Kyuubi has no defense against. This could make the Kyuubi, which is used to being a dominant and feared force, feel vulnerable. For example, if Naruto has the power to nullify the Kyuubi's chakra or to manipulate it in a way that goes against the Kyuubi's will, it would be a cause for fear.
Maybe it's because Naruto has some sort of special connection or resemblance to the Kyuubi that Kushina notices. For example, Naruto might display some of the Kyuubi's power characteristics in an obvious way that makes Kushina jump to that conclusion.
At first, Naruto might see the Kyuubi as just a source of power. But as he starts to protect it, he realizes it's more of a partner. Their relationship evolves from a simple user - power source dynamic to a deep - seated friendship. He begins to understand the Kyuubi's emotions and past, which further cements their bond.
Sasuke is often a popular character in these fanfictions. His relationship with Naruto can be further explored in the context of the Kyuubi's fatherly influence. Maybe Sasuke is initially skeptical of this new - found bond between Naruto and the Kyuubi but later comes to accept it. Sakura is also a common character. She might notice the changes in Naruto due to the Kyuubi's fatherly presence and be either supportive or a bit jealous. Kakashi could also be there. He might be observing Naruto's growth under the Kyuubi's guidance and offer his own wisdom as Naruto's former teacher.
In this fanfiction, their relationship becomes more of a partnership. Instead of Naruto just using the Kyuubi's power, they work together as brothers. Naruto might start to understand the Kyuubi's feelings and motives better.
One consequence could be that he becomes extremely powerful. His physical abilities like strength, speed, and endurance are enhanced. He can also use more powerful jutsus with the extra chakra boost from the Kyuubi.