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.
One possible reason could be that Videl does something that endangers herself. Gohan, being protective, might get angry out of fear for her safety. For example, if she recklessly jumps into a fight without proper training or preparation.
However, it could also be a turning point. If Gohan realizes that his anger is misdirected or if he communicates his reasons for being angry to Videl, it could strengthen their relationship. They could learn more about each other's boundaries and grow closer as a result.
Another scenario might be when someone undermines his power or mocks his Saiyan heritage. Gohan, having grown up with a sense of pride in his Saiyan roots, would get angry and show his true strength to prove them wrong. He might also get angry if he sees innocent people being bullied or oppressed, as he has a strong sense of justice.
In such a fanfiction, one possible plot could be that Gohan and 18 have been through many adventures together and gradually developed deep feelings. Their relationship deepens over time, leading to the situation where 18 becomes pregnant. It might involve Gohan's growth as a character, from a shy boy to a confident man ready to take on family responsibilities.
The 'Gohan gets revealed as Saiyaman fanfic' could have a plot twist where Gohan is forced to reveal his identity to save someone. Say a villain has captured Videl, the girl he has feelings for, and the only way to rescue her is by showing his true self as Saiyaman. This would not only expose his identity but also his feelings for Videl. Another plot twist could be that Gohan's Saiyaman identity is actually a clone created by an enemy. So when the real Gohan shows up at the same time as Saiyaman, it causes mass confusion. And finally, it could be that Gohan's reveal as Saiyaman leads to a new form of training for him. Since his identity is out in the open, he has to learn to fight without the disguise and in a more public way, which forces him to develop new techniques and powers.
There could potentially be such a fanfiction, but it might not be very common. Dragon Ball Z has a large and diverse fan base, and while many fanfictions explore different relationships and events, pregnancy for Pan might not be a mainstream theme. Some fanfictions focus more on battles, power - ups, and character development rather than this kind of family - related plot.
Often, in fanfictions where Hiccup gets mad, there's a plotline about him getting angry with his father's old ways being forced upon him again. Maybe the elders on Berk want to go back to the old dragon - fighting traditions, and Hiccup is furious because he has worked so hard to create peace between dragons and humans. He might have to fight against this in a very angry and determined way. Additionally, he could get mad at someone who mistreats a dragon he has befriended, which would trigger his protective side and his anger towards the wrongdoer.
One idea could be that Ron has been having a bad day and seeing Hermione at the Quidditch match makes him snap because he feels she should be studying instead. Maybe he's worried about upcoming exams and thinks Hermione is being too carefree. Another idea is that Ron is jealous. He sees Hermione chatting with one of the Quidditch players and gets mad because he secretly has feelings for her but doesn't know how to express it.