Maybe the ghost child is the result of a curse placed on a family in Konoha. Naruto stumbles upon the mystery when he notices strange occurrences around a particular house. The child's ghost is bound to the place due to the curse. Naruto then tries to find a way to break the curse with the help of his friends. Another plot idea could be that the ghost child is from a different dimension that somehow got linked to the Naruto universe. The child is scared and alone, and Naruto has to figure out how to send the child back home while also protecting the world from any potential threats that might come with the connection between the two dimensions.
One idea could be their child having a special power that neither Naruto nor Ino possess. For example, the ability to communicate with animals in a very unique way. This could lead to adventures where the child helps solve problems in the village related to the animal kingdom.
One idea could be a child genius Naruto who quickly masters advanced jutsu way before his peers. For example, he might figure out how to combine multiple elemental jutsu at a young age, creating a completely new and powerful attack.
A great plot could be the child getting lost in a mysterious forest that has some long - forgotten secrets related to the Hyuga clan. As they search for a way out, they start to have visions of Hinata's past and learn more about their family's history. Or perhaps the child is chosen for a special mission that involves traveling to a far - off land where they meet new friends and allies, and together they have to face an ancient evil.
One plot idea could be Orochimaru seeing some potential in child Naruto that is different from the Nine - Tails. Maybe he wants to train Naruto in a different form of jutsu, not for evil but for some self - serving yet not completely malicious purpose. For example, he could be interested in Naruto's ability to make friends and wants to use that to his advantage in the ninja world.
One idea could be that Naruto's chakra system gets hacked in a way similar to how technology can be hacked in Ghost in the Shell. This forces him to find new ways to fight and use his skills. Another could be a crossover where some of the Ghost in the Shell characters are brought into the Naruto world and they have to adapt to the use of chakra. A third idea might be that Naruto's clones are given some sort of artificial intelligence upgrade, making them more autonomous and strategic like the cyborgs in Ghost in the Shell.
Maybe in this fanfic, the ninjas in Naruto's world discover a strange technology similar to what's in Overwatch. They try to figure out how to use it while also dealing with a group of rogue ninjas who have been influenced by a dark power, which they call the 'Ghost'. Overwatch agents then show up to help, thinking the situation is related to their own world's problems. This leads to a lot of cultural clashes and interesting interactions between the two groups.
One idea could be that Hashirama's ghost appears to Naruto during a crucial battle. He imparts some long - forgotten jutsu or strategy that was unique to the Senju clan. This could give Naruto an edge in the fight and also help him understand more about the history of the village.
One idea could be exploring how the child of prophecy discovers their true power earlier than in the original Naruto story. Maybe they start to unlock unique jutsu that no one has ever seen before, which changes the course of the ninja world.
One idea could be that Naruto discovers a lost child during one of his missions. He decides to take the child under his wing. The child might have some unique power that attracts the wrong kind of attention, and Naruto has to protect the child while also teaching them the ways of the ninja. It could also involve Naruto trying to balance his duties as Hokage and being a father figure to the child.
A plot could involve a magical accident that fuses Naruto and Ghost Rider's essences. This new being has a strange allure and power. In the Naruto universe, female characters start to gather around this new entity. There could be a lot of drama as the harem members come from different ninja clans and have different motives. Some might be in it for the power, some for true love, and they all have to deal with the challenges that come with this new and powerful being in their midst.