In a 'naruto son of gohan fanfiction', perhaps Naruto is born with a special power that is a combination of his own ninja abilities and some latent power from being related to Gohan. This could lead to him being an outcast at first in the ninja world as his powers are so different. But as he grows, he learns to master them and use them to protect his village and the world from new threats.
This idea is quite out - there in fanfiction. One way it could work is if there are some powerful deities or beings in both universes who decide to manipulate the fates of characters. They could use their powers to transplant Naruto's essence into a new world where Gohan and Videl exist and make them his parents. However, this would completely change Naruto's origin story and his character development would have to be re - imagined in the context of the Dragon Ball world, which has very different power systems and cultures compared to Naruto's world.
Gohan himself could be a main character in some form. Maybe he exists in Naruto's memories or as a spirit guide. Another potential main character could be Sakura. She might be interested in Naruto's new powers and try to help him understand and control them. And of course, there could be new characters introduced from Gohan's world that interact with the Naruto characters.
Naruto would likely have a very different life. He'd grow up in a world full of Saiyans and other Dragon Ball characters. Instead of learning ninjutsu, he might be trained in martial arts and ki control. His friends would probably be different too, like Goten and Trunks. And his goals might shift from becoming Hokage to perhaps protecting the Earth from otherworldly threats like in the Dragon Ball series.
Gohan has the advantage of his Saiyan heritage which gives him natural fighting abilities and the ability to increase his power rapidly. But Naruto has trained hard all his life and has the ability to tap into the power of the Nine - Tails. In a fight, if it was in an open area, Gohan might be able to use his flight and long - range energy attacks to his advantage. But if they were in a more enclosed space, Naruto could use his ninja skills like stealth and close - combat jutsu. Also, Naruto has his Sage Mode which gives him enhanced senses and strength. So, it really depends on the circumstances of the fight.
Yes, there are some out there. You can start by looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Naruto brother of Gohan' and you'll likely find a variety of stories with different takes on this unique crossover concept.
I'm not aware of any such fanfiction. The relationship between Grandpa Gohan and Son Goku in the original story is one of love and mentorship, so this kind of dark and negative portrayal in fanfiction is not common that I know of.
In this fanfiction, Gohan as a girl could bring a new dynamic to her relationships. She might have a different kind of friendship with Videl. Instead of the typical male - female relationship they had before, it could be more of a sisterly bond where they support each other in different ways, like in fighting crime together in a more united front.
Sometimes other characters can also be important. For instance, Piccolo from Dragon Ball might show up to give Gohan some advice or help in the fanfiction. In the Naruto side, Sasuke could also be involved, perhaps starting off as an antagonist to the new team - up of Gohan and Naruto, but then later joining them. Also, characters like Bulma from Dragon Ball could play a role, maybe she creates some device that helps in the story, like a way to translate between the Saiyan and ninja languages.
In a 'naruto meets gohan fanfiction', it's possible that they would form an unlikely friendship. Naruto, being the friendly and outgoing type, would likely initiate the conversation. They could find common ground in their goals of protecting their respective worlds and loved ones. They might also face a common enemy that requires both their unique skills to defeat, leading to an epic battle and an even stronger bond between them.