Perhaps the main plotline is about their relationship development under Kyuubi's raising. Kyuubi, having a different perspective on things, could encourage a closer bond between Naruto and Hinata from a very young age. Instead of the slow - burning relationship in the original series, they might become a power couple much earlier. This could also affect how they approach their ninja duties. They might be more focused on protecting each other and the village together, with their relationship being a central focus of the fanfiction.
One possible main plotline could be that Naruto and Hinata, under Kyuubi's influence, grow up with a different understanding of power. They might be more in tune with the fox's chakra from a young age, leading to them developing unique ninja techniques. For example, Naruto could combine his natural Uzumaki resilience with Kyuubi - influenced skills earlier. Hinata, too, might gain confidence faster as the Kyuubi could instill a sense of protection in her. This could change the way they interact with their peers and the village as a whole.
A main plotline could be Naruto being trained in ancient ninja arts that Hagoromo knew. These arts could be lost to the modern ninja world. So, Naruto would have an edge in battles. For example, he could learn some unique sealing techniques that were forgotten over time. This would make him a target for those who want to use his skills for their own gain. Another aspect could be Naruto's relationship with the other villages. With Hagoromo's influence, he might try to establish a more equal and peaceful co - existence among all the villages from a very young age. He could also be involved in uncovering secrets about the origin of the ninja world that Hagoromo knew but were long forgotten.
Naruto would likely be more confident earlier. With Kyuubi as a sort of mentor - figure, he wouldn't have to face as much ridicule from the village. He'd probably have a better understanding of his own power and how to control it, making him a more formidable ninja from a younger age. As for Hinata, she might be less shy. Kyuubi's influence could give her the courage to speak up more and be more assertive, not just in her relationship with Naruto but also in general ninja affairs.
One possible main plotline could be Naruto growing up with Kakashi's unique training methods. Since Kakashi is known for his strict and strategic training, Naruto might develop different skills compared to the original series. Another plotline could be how Naruto deals with the abandonment issues from his past while having Kakashi as a father figure. He could struggle with trust issues at first but gradually open up as Kakashi shows him unconditional love and support.
One possible plot twist could be that the female Kyuubi imparts unique jutsu knowledge to Naruto that no one else in the village has. This could make Naruto a target of envy and suspicion among his peers at first. Another plot twist might be that the female Kyuubi has a hidden agenda related to an ancient prophecy that Naruto unknowingly is a part of. This could lead to Naruto being forced to make difficult choices between his loyalty to the village and the Kyuubi's plan.
The plot could also involve a time - related crisis. Maybe something is threatening the timeline, and the only way to fix it is for future Naruto to raise his younger self in a certain way. So, future Naruto has to make sure that the younger Naruto grows up to be strong enough to face this threat while also maintaining the integrity of the timeline.
One possible plotline could be that Naruto grows up with a different set of values. Mikoto might teach him more about the Uchiha clan's ways, which could influence his fighting style. He may also have a closer relationship with Sasuke from the start as they are both in the same 'family' of sorts.
In a Naruto raised by Yugao fanfiction, perhaps Yugao would instill in Naruto a deeper sense of loyalty to Konoha. Since she is a dedicated shinobi herself, she could raise Naruto with stories of Konoha's heroes and the importance of protecting the village. This might lead to Naruto having an even stronger bond with Konoha from an earlier age.
One possible plotline could be that Iruka instills in Naruto a deeper sense of self - worth from a very young age. Since Naruto has always been starved for recognition, Iruka's positive influence might make Naruto more confident in his abilities earlier. For example, he could start training more seriously and master certain jutsu faster. Another plotline might involve Iruka protecting Naruto from some of the harsher elements in the village that Naruto would have otherwise faced alone. This could lead to a different dynamic between Naruto and the villagers as they might see Naruto in a new light because of Iruka's actions. A third plotline could be that Iruka, being Naruto's main caregiver, helps Naruto understand his parents better. Maybe Iruka discovers some hidden secrets about Naruto's parents and shares them with Naruto at the right time, which gives Naruto a new sense of purpose and connection to his family heritage.
One possible plotline could be Naruto as the 6th Hokage facing a new threat to the village. Hinata, being his wife, supports him from behind the scenes. She might use her Byakugan to gather intelligence. Naruto, with his leadership skills and Hinata's support, unites the village to combat the enemy.
One possible plotline could be that Naruto is kidnapped by Kyuubi to gain some sort of power or knowledge from him. Maybe the Kyuubi believes Naruto has a secret that can help it break free from its current state. Another could be that Naruto is kidnapped as a way to get back at the Hidden Leaf Village, and the Kyuubi uses Naruto as a bargaining chip. It could also be that there is some external force that makes the Kyuubi kidnap Naruto, like a dark wizard or something similar that has control over the Kyuubi.