In some fanfictions, Naruto might be able to seal the Kyuubi into his baby self through some powerful, self - created jutsu. Maybe he discovers a way to manipulate time and space in a unique manner that allows him to perform this seemingly impossible feat.
One consequence could be that Naruto grows up with an even stronger connection to the Kyuubi's power from a very young age. This might make him a much more powerful ninja earlier on in his life.
Fanfiction about 'Dark Naruto, Kyuubi, Memory Seals' can take many forms. One possibility is that the memory seals are tampered with by an outside force. This could be an enemy who wants to unleash the power of the Kyuubi and corrupt Naruto. The 'Dark Naruto' that emerges might have different abilities compared to the regular Naruto. He could be more aggressive and less hesitant to use the Kyuubi's power without the moral restraints that the original Naruto has due to the disrupted memory seals.
In fanfiction, the Kyuubi's power is often a catalyst for the creation of Dark Naruto. Memory seals are used to control the Kyuubi's power within Naruto. If these seals are broken or weakened, the Kyuubi's influence can turn Naruto 'dark'. For example, the Kyuubi's chakra might seep into Naruto's mind and distort his thoughts, and the broken memory seals can't prevent this transformation.
Well, for the village in this fanfiction, there are several consequences. Firstly, there's the issue of security. They have to worry about the Kyuubi breaking free from Naruto. This means they might need to invest more in defenses. Socially, the presence of Naruto with the Kyuubi sealed in him can cause a rift. Some villagers might be more accepting, but others will always be fearful. Economically, they may have to spend resources on researching ways to better control the Kyuubi's power or to protect the village from any potential disasters related to the Kyuubi.
One interesting plot twist could be that the sealing process goes wrong in a completely unexpected way. Maybe instead of just sealing the Kyuubi's chakra, Naruto accidentally fuses with it on a spiritual level, giving him new and uncontrollable powers at first. Another could be that during the sealing, a dark entity from another dimension tries to interfere and take over the Kyuubi's power within Naruto. It would add a whole new layer of conflict and mystery to the fanfiction. Also, perhaps the seal actually has a hidden purpose that was set by an ancient force long ago, and as Naruto discovers bits of this, it changes his understanding of his role as the Kyuubi's host.
Well, in Naruto seals Kyuubi fanfiction, Naruto's character development is multi - faceted. Firstly, the very act of sealing the Kyuubi forces him to confront his own power and limitations. He may start to train harder to better control the new power he gets from the seal. Secondly, his relationships with others may change. His friends might be worried about him during the sealing process, and this could strengthen their bonds. He may also have to face the judgment of some in the village who are afraid of the Kyuubi within him. This could make him more determined to prove himself as a force for good. Additionally, as he battles with the Kyuubi's chakra during the sealing, he could gain a new understanding of the ninja world's balance of power and his place in it, which would lead to a more nuanced and mature Naruto overall.
Obviously, Naruto is one of the main characters as the title implies he is the one sealing the Kyuubi. Also, the Kyuubi itself is a main character in a sense. It has a major role in the story as it is the entity being sealed.
Yes, in the vast world of fanfiction, there are some really out - there concepts. There could very well be such a fanfiction exploring this highly unusual and creative scenario. However, it would likely be a very niche and perhaps controversial piece due to the nature of the concept. It might involve a lot of creative license in terms of how the pregnancy could even be possible in the Naruto universe's lore and mechanics.
In fanfiction, such a concept could lead to an interesting story. The baby might inherit Naruto's determination and the Kyuubi's power. It could be a powerful force for good in the Naruto universe, perhaps having unique abilities that no one has seen before. Maybe the baby would have to learn to control its power from a young age, just like Naruto did with the Kyuubi's chakra.