Perhaps the fanfiction could be about Gohan finding a strange egg. When it hatches, out comes a small, cute but powerful creature. Frieza, being his power - hungry self, mistakes it for a new source of power. Gohan befriends the pet and together they outwit Frieza at every turn. For example, the pet has the ability to create illusions which they use to deceive Frieza.
In this fanfiction, Gohan could be given a pet by the Kais as a reward for his good deeds. This pet has the ability to nullify Frieza's powers. Frieza, of course, doesn't like this and tries to capture the pet. Gohan trains with his pet to become even stronger and they face off against Frieza in an epic battle where Gohan's bond with his pet gives him the edge.
One possible plot could be that Gohan discovers an injured alien creature that he decides to keep as a pet. However, Frieza somehow gets wind of this unique pet and wants to take it for his own evil purposes, like using its powers for his galactic domination plans. Gohan then has to protect his new pet from Frieza.
Obviously, Frieza would be a main villain. He is always power - hungry and self - centered. If Gohan has a pet with some special powers, Frieza would want to take it for himself or destroy it out of jealousy.
One idea could be that Frieza, after being resurrected yet again, finds himself in a situation where he has to team up with Gohan. During their time together, they start to understand each other's motives and past traumas. Gohan's kindness and sense of justice gradually influence Frieza in unexpected ways.
One possible plot could be that Yamcha, known for his tenacity, somehow ends up in a situation where he has to team up with Frieza. Maybe they are both forced to face a common enemy that is even more powerful than Frieza at his peak. This could lead to an interesting dynamic as Yamcha tries to get Frieza to work as a team, while Frieza is his usual self - conniving and power - hungry. Their interactions would be full of tension and mistrust at first, but over time, they might develop an odd sort of respect for each other.
Well, one possible plot could be about how Frieza deals with the physical and emotional changes. Maybe he has to hide his pregnancy from his enemies as it could be seen as a sign of weakness. He might also struggle with the idea of becoming a parent, considering his usually evil and self - centered nature.
Maybe Gohan is summoned to the Sekirei world for some unknown reason. He then befriends some of the Sekirei and starts to train them in martial arts. This would not only help the Sekirei in their battles but also change their perspective on strength. Gohan's kind heart and strong sense of justice would lead him to oppose the Ashikabi system if he finds it unjust, and he'd try to find a new way for the Sekirei to coexist peacefully.
A plot could involve a world where the Naruto and Dragon Ball universes merge. Naruto meets Gohan at a young age. Gohan teaches Naruto about ki control, and Naruto teaches Gohan about chakra control. They then discover a dark force that is threatening to destroy their newly merged world. Together, they train and combine their powers to stop this threat, with Naruto using his shadow clones in unique ways and Gohan going Super Saiyan to gain an edge in battle.
Well, it could be about a character in the Naruto universe who discovers they have some sort of connection to Frieza. Maybe they inherit his power and have to struggle with how to use it in a world that doesn't understand such alien abilities. They might face discrimination or fear from others in the shinobi world.
In a Gohan in High School DxD fanfiction, Gohan could be a special exchange student. He has to balance his studies and his new life in this strange world filled with devils and angels. He might start a martial arts club in the school, which becomes popular. But his real purpose could be to find a way to bring peace between the different factions, using his Saiyan abilities and kind heart.
It could be that Gohan is kidnapped by a group who wants to study the Saiyan physiology. They might be scientists from a different planet or a secret organization on Earth. They take Gohan in order to run various tests on him, not realizing the danger they're in if Gohan manages to break free. And his friends and family then have to go on a mission to rescue him.
One possible plot could be that Gohan and 18 meet in a rather unexpected situation, like at a martial arts tournament. They start to have conversations and find out they have more in common than they thought. Gohan's kind and intelligent nature attracts 18, and her strong and independent personality intrigues Gohan. As they spend more time together, they gradually fall in love and decide to get married, facing some challenges from their different backgrounds along the way.