It could be that the 'secret prodigy' in the fanfiction is not their biological child but a young ninja they take under their wing. This young ninja has a natural talent for both Naruto's ninjutsu and Hinata's taijutsu. The plot might be about how Naruto and Hinata train this prodigy to become a great ninja and face various challenges together.
Well, it could be about Naruto and Hinata's child who turns out to be a secret prodigy. Maybe this child has some unique powers that neither Naruto nor Hinata had expected. For example, the child could have the ability to combine Naruto's Rasengan with Hinata's Gentle Fist in a completely new and powerful way, and the story could revolve around how they discover and train this power.
Perhaps the fanfiction is set in a time when Naruto and Hinata are already married. Their secret prodigy child is hiding a special ability that is related to the ancient secrets of the Hyuga clan and the Uzumaki clan. The story might focus on how the child uncovers these secrets and uses them to save the village from a new threat.
It could be about Naruto and Hinata going on a secret adventure together. Maybe they discover a hidden place in Konoha that no one else knows about and have to protect it from some sort of threat.
The secret prodigy is also a main character. Whether it's their own child or someone they are guiding, this character will drive the plot forward with their special abilities and the challenges they face. There might also be other supporting characters from the Naruto universe, like their friends from the village, who play important roles in the story.
Perhaps in this fanfiction, Naruto is a prodigy in the field of medical ninjutsu. He accidentally heals a complex injury with ease, and this discovery sets him on a path to explore this hidden talent. Along the way, he has to deal with the disbelief of his peers, the envy of some, and the interest of powerful medical ninjas who want to either help him or use his talent for their own purposes. This new aspect of his character could also change his relationships with his friends and how he is perceived in the ninja world.
The plot might involve the child being hidden away for their safety. Since Naruto and Hinata are well - known and powerful, there could be many who would want to harm the child. So they grow up in a secret location, perhaps with only a few trusted people knowing their true identity. As they grow older, they start to discover their heritage and the responsibilities that come with it.
Well, it could be about Naruto and Hinata working on a super - secret ANBU mission together. Maybe they have to infiltrate an enemy stronghold and they discover new things about each other during the mission. Their relationship might deepen as they rely on each other's skills in the dangerous situation.
One possible plot could be that Naruto discovers his medical talent early on. He then uses it to heal his injured friends during missions, much to their surprise. This new skill also earns him respect from some of the more skeptical characters in the village.
Well, it could be about Naruto being overlooked despite his great potential. Maybe he's constantly underestimated by his peers and even some of his teachers. He might secretly develop amazing skills that no one notices until a crucial moment in a battle or some big event.
A simple plot could be that Hinata gets injured while on a mission, and Naruto takes it upon himself to nurse her back to health. During this time, they have long conversations and get to know each other on a deeper level, leading to the start of their romantic relationship.
Well, it could be about a young prodigy in the Anbu who is overlooked because of Naruto's fame. Maybe this prodigy has amazing skills like being able to use unique jutsus or having extraordinary stealth abilities. But everyone is so focused on Naruto that the prodigy is left in the shadows and has to struggle to prove himself.
A simple plot could be that the neglected prodigy jounin discovers a long - forgotten jutsu. He then uses this jutsu to outperform others in a series of challenges set up in the village. This makes the villagers realize they had been neglecting a great talent all along.