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.
There may be some extremely creative and boundary - pushing fanfiction out there with this premise, but it's not something that is typically found in the more well - known or widely - accepted "How to Train Your Dragon" fanfiction. Usually, fanfictions in this fandom focus on things like their adventures, friendship, and the development of their bond in a more traditional sense. So, while it's possible, it's not a common plot line.
In fanfics, Astrid could be mad at Hiccup for various reasons. One reason could be that he breaks a promise to her. For instance, if he promised to help her train a difficult dragon but then backs out because he got distracted by another project. This would make Astrid, who values loyalty and commitment, mad at him. Another reason might be miscommunication. If Hiccup doesn't clearly express his intentions or feelings, it can lead to misunderstandings and Astrid's anger.
Another possibility is a jealous rival. Maybe there's someone who is jealous of Gohan's power or his relationship with certain characters. This rival could do things to annoy Gohan and push him to the edge of his temper.
A new player on an opposing team could be the cause. This new player might be overly cocky and disrespectful towards Kuroko during a game. They could constantly taunt him about his lack of presence, which finally gets on Kuroko's nerves and makes him mad.
It could be Vegeta. Maybe Vegeta does something really underhanded like stealing Goku's senzu beans or trying to take all the credit for a victory that Goku also contributed to. Goku, being a fair - minded person, would get angry at such behavior.
One of his friends could be the cause, accidentally. Maybe a friend makes a deal with a shady character without realizing the consequences. This deal ends up putting everyone in danger, and Yami gets mad at his friend's naivete and the mess they've created.
One great 'Hiccup Gets Amnesia' fanfiction is 'Lost Memories' on FanFiction.net. It really delves into how the other characters react to Hiccup's amnesia. They struggle to bring back the old Hiccup while also dealing with the new, confused version of him. The story is full of emotion as Toothless tries his best to re - bond with Hiccup, which is really heart - warming.
I'm not sure if there is such a specific fanfiction. There are countless fanfictions out there, but this particular one might be quite rare or even non - existent. You could try searching on major fanfiction websites, but don't be too disappointed if you don't find it.
Another character could be Astrid. In the fanfiction, she might play a role in Hiccup's journey to get stronger. She could be his training partner or offer advice based on her own skills and experiences. Also, there might be new characters introduced, like an old dragon trainer who has a lot of wisdom to share with Hiccup.