In certain 'Gohan the Gamer' fanfiction, it could be a group of players who are jealous of Gohan's skills. They form an alliance to try and drive Gohan out of the game. They might spread false rumors about him in the game community or try to hack into his account to get him banned from the game.
Well, it could be a powerful gamer who has a grudge against Gohan. Maybe this gamer has lost to Gohan in some important in - game tournaments and now wants revenge. So he devises all kinds of devious plans to undermine Gohan's progress in the game.
Sometimes, the antagonists could be digital entities that have become self - aware within the game. They see Gohan as a threat to their existence or to their control over the game world. So they send all kinds of digital monsters and challenges his way to stop him.
The Khaos Brigade could be a major antagonist. Their goal of causing chaos would put them at odds with Gohan's sense of justice.
It's possible that the main antagonist is a jealous classmate. This classmate is envious of Gohan's popularity among some students or perhaps his natural talents. So, he or she tries to undermine Gohan at every turn, until Gohan can't take it anymore and snaps.
Cell - like characters are often antagonists. Since Cell was such a major foe in the original series, new versions of Cell - like beings could be created in fanfiction to make Gohan angry. They might target his loved ones or the Earth itself, provoking Gohan's rage.
If it's a crossover with the One Piece world, Blackbeard could be a potential bad guy. His ability to steal Devil Fruit powers and his ambition to become Pirate King could lead to a clash with Gohan. Gohan's pure - hearted nature would be in opposition to Blackbeard's more devious ways, and their battle could be epic, with Gohan's ki powers against Blackbeard's dark powers.
In a crossover with the DC Universe, Darkseid would be a great antagonist. His immense power and his desire for universal domination would put him at odds with Ultimate Gohan who stands for justice and protecting the innocent.
Perhaps Orochimaru could still be an antagonist. In this fanfiction, he might be jealous of Naruto's new god - like gaming powers and try to steal them for his own experiments.
One common theme is the fusion of Gohan's real - life powers and his gaming abilities. For example, he might use his ki blasts in a game. Another theme is self - discovery. As he games, he learns more about himself.
Another interesting plot could be Gohan getting trapped in a particularly dangerous game. He has to use his wits and powers not just to survive but also to find a way to escape. And as he progresses, he discovers secrets about the game's origin that are somehow related to the Dragon Ball universe, like the game being created by an old enemy to test and potentially defeat Gohan.
One interesting gohan gamer fanfiction could be about Gohan using his gaming skills to train for real - life battles. For example, he might play strategy games to improve his combat planning in the Dragon Ball universe.
It could be a new villain created specifically for the fanfiction. Maybe a powerful sorcerer who wants to steal the Saiyan's power.