One interesting scenario could be a battle in a neutral dimension where Gohan's Saiyan powers and Naruto's ninja techniques are put to the test. Gohan's super strength and ability to go Super Saiyan might be pitted against Naruto's shadow clone jutsu and Rasengan.
It's really hard to say. If we consider Gohan at his most powerful, like when he's a Super Saiyan 2, his raw power is off the charts. He could potentially one - shot Naruto with a powerful energy blast. But Naruto has his nine - tailed fox form which gives him a huge boost in power and speed. So it depends on the situation and how the author writes it.
In Gohan vs Naruto fanfics, a really cool plot is when their powers get combined somehow. For example, due to a magical or scientific accident, Gohan's ki and Naruto's chakra merge, creating a new and powerful force. Another interesting plot is when they have to fight in a world that has rules that are different from both of their own. This forces them to adapt in unique ways. Also, a plot where they are both de - powered and have to rely on their wits and basic fighting skills to compete can be very engaging.
In a Gohan vs Naruto fanfic battle, I think Gohan would win. His Saiyan heritage gives him a natural advantage in terms of raw power. He can fly and has energy blasts that could overpower Naruto. Naruto is strong, but his powers are more about ninjutsu and chakra control. Gohan's Super Saiyan forms would be too much for Naruto to handle.
One common theme is adventure. Since Gohan has his Beast form, they might go on adventures together fighting enemies. Another theme could be romance, exploring their relationship deeper.