Perhaps Gohan sacrifices himself to save the other Z - fighters. He might choose to take on Cell's full - power attack that was meant for all of them, and in the process, he loses his life. In the fanfiction, it could also be that Cell has some sort of hidden power - up that catches Gohan off - guard and leads to his death.
In this fanfiction, if Gohan dies in the Cell Games, perhaps the story could focus on how the other characters cope with the loss. For example, Chi - Chi could become a more hardened character, vowing revenge on Cell or any other threats. Piccolo might take on a more fatherly role to Goten, trying to train him to be as strong as Gohan was. And the Earth might be in a state of mourning, which could attract new villains who see it as a time of weakness.
Perhaps Gohan's own overconfidence could lead to his death. He might underestimate an enemy's power or a dangerous situation and make a wrong move that results in his end. For example, he could rush into a fight without proper preparation thinking he can handle it easily.
If Gohan dies in the Cell Games in fanfiction, Goku and Chi - Chi's relationship would be severely strained. Goku might blame himself for not being able to protect their son, and Chi - Chi would be heartbroken and potentially angry at Goku. Vegeta's relationship with Goku could also change. He might respect Goku more for his pain, or he could become more competitive, vowing to never let his own family be in such a position.
The story could progress with a darker tone. There would be a lot of mourning at first. Then, the remaining characters might start to look for ways to prevent future threats more aggressively. For example, Bulma could use her scientific skills to develop new weapons or defenses.
Well, the story could take a very different turn. Gohan was a symbol of hope for a new generation of fighters. His death would shatter that hope. The remaining Z - Fighters would have to reevaluate their strategies and training methods. Maybe they would start to focus more on group attacks rather than relying on individual powerhouses like Gohan. And the fanfiction could explore how the other characters grow and change in the face of this great loss. They might also seek new allies or ways to resurrect Gohan, which could lead to all kinds of new adventures and challenges.
Another scenario could be that Gohan contracts a deadly and incurable disease in the fanfiction world. Despite the efforts of his family and friends, including the use of any available advanced technology or magic, he succumbs to the illness, leaving everyone in mourning.
It could be a new villain created specifically for the fanfiction. Maybe a powerful sorcerer who wants to steal the Saiyan's power.
Trunks could also be a popular character in such fanfictions. He might be curious about Gohan's interactions with Cell and get involved in their affairs. His time - traveling knowledge could add an interesting twist to the story. Also, Vegeta could be included. His pride might not allow him to accept Gohan getting too close to Cell and he could try to put an end to their relationship or partnership in the fanfiction.
One idea could be to focus on Gohan's internal struggle during the Cell Games. Maybe he's doubting his abilities even more than shown in the original, and it's through his friends' and family's words of encouragement that he finally finds his resolve.