Perhaps in this fanfiction, Naruto is neglected because of a prophecy that foretells of his great power which scares the people in his village. He then stumbles upon a way to enter the Dragon Ball universe. In this new universe, he meets Bulma who is intrigued by his strange powers. With her help, he tries to find a way to either go back to his world and prove his worth or make a new life in the Dragon Ball universe. Along the way, he gets into battles with the likes of Frieza when the tyrant tries to take over a planet that Naruto has come to care about.
One possible plot could be that in a world where Naruto characters co - exist with Dragon Ball Z characters, Naruto is so focused on his own ninja world problems that he completely overlooks the power and significance of the Dragon Balls. For example, villains from the Naruto world might accidentally stumble upon the Dragon Balls and try to use them without understanding their true power. Meanwhile, Goku and his friends are trying to retrieve the balls from this new, unaware threat.
The Z - fighters like Krillin and Yamcha would be curious about Naruto. Krillin might try to befriend him quickly, while Yamcha might be a bit jealous if Naruto starts getting a lot of attention. In the Naruto world, characters like Sakura and Sasuke might not even notice Naruto's disappearance at first if he has been neglected. But later, they might realize the importance of Naruto when things start to go wrong in their world without him. And in the Dragon Ball universe, Piccolo would be very watchful of Naruto, trying to figure out his motives and if he poses any threat to the safety of the planet.
It could be Orochimaru. In this fanfiction, Orochimaru might hear rumors about the Dragon Balls and their power to grant wishes. Since he is always seeking power and immortality, he decides to hunt for the Dragon Balls. However, because Naruto is so focused on his own battles against Orochimaru in the ninja world, he fails to realize that Orochimaru's new goal involves the Dragon Balls and the entire Dragon Ball Z universe could be at risk.
In some Dragon Ball Z fanfiction where Gohan is neglected, it might explore how he copes with the lack of attention. Maybe he turns to self - training more intensely. He could also form unexpected friendships with other characters who notice his isolation.
A possible plot could be Gohan focusing on his academic life more. Since he's neglected in the fighting and superhero side of things, he throws himself into his studies and becomes a super - intelligent character who uses his brain to solve problems in the Dragon Ball Z world that others can't with just brute force.
One great Dragon Ball and Naruto fanfiction is 'The Ninja Saiyan'. It combines the unique powers of the Saiyans from Dragon Ball with the ninja skills in Naruto. The story follows a character who has the blood of both a Saiyan and a ninja, and his journey to master both powers and protect his world from new threats.
You can try some well - known fanfiction websites like FanFiction.net or Archive of Our Own (AO3). Just use the search terms 'dragon naruto neglected' on these platforms, and you should be able to find relevant stories.
One could be a story where Naruto has a hidden dragon - like power that has been neglected. Maybe in a fanfic, he discovers this power when facing a powerful enemy alone in a forest. His friends don't believe in this power initially, but as he starts to master it, they come to see its potential.