Well, perhaps in the fanfiction, Hiccup's harem starts to form after he becomes a more prominent figure in the Viking world. His new - found status and his ability to communicate with dragons make him quite the catch. Some girls in the harem might be there because they admire his skills in dragon - riding. And then there could be some drama within the harem as the different characters vie for Hiccup's attention, each bringing their own personalities and skills to the group.
One possible plotline could be that Hiccup, with his unique leadership skills and kind heart, attracts various female characters from his world. They might initially be drawn to his courage in facing dragons. For example, Astrid could be part of the harem, and together with other female Vikings, they form a group that supports Hiccup in his adventures and also have romantic interests in him. Another plotline could involve Hiccup meeting new female characters from different tribes during his travels, and they all fall for his innovative ideas about co - existing with dragons.
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.
Astrid is an obvious choice. She already has a close relationship with Hiccup in the original story. Then there could be Ruffnut and Tuffnut's sister, who might see Hiccup in a new light and be attracted to his growing confidence. Also, some new characters from unexplored Viking tribes could be part of it. Maybe a healer from a far - off land who is intrigued by Hiccup's connection with dragons.
Well, it could be that in this fanfiction, Frisk gets bullied because they come from a different background than the others. The bullies target Frisk for being an outsider. As the story progresses, Frisk could meet a mentor - like character who helps them gain confidence and teaches them how to deal with the bullies. Frisk might then use kindness and understanding to turn the situation around and make the bullies realize their mistakes.
Perhaps Sakura decides to learn self - defense techniques to protect herself from the bullies. This could lead to her gaining confidence and eventually standing up to them on her own.
One possible plotline could be that after Deeks gets shot, his colleagues in the team rush to his aid and there is a tense moment at the hospital as they wait to see if he'll survive. They start to reflect on their relationships with him and how important he is to the team.
Maybe it's a story where Hermione accidentally gets caught in the middle of a wizard duel gone wrong. One of the angry duelists punches her in a fit of rage. Then the story could focus on how she deals with the injury and the chaos that follows, as well as her pursuit of justice for the unprovoked attack.
One possible plotline could be that Sonic is facing a new and extremely powerful villain who manages to outwit him in a battle and ultimately kill him. This could lead to his friends, like Tails and Knuckles, vowing revenge and setting out on a journey to become stronger to face the villain.
One possible plotline could be that Tails is killed by a powerful enemy during a battle to protect his friends. Maybe a new, extremely strong villain emerges and Tails sacrifices himself to buy Sonic and the others time to escape. Another could be that there is some sort of accident in Tails' workshop while he is working on a dangerous experiment, leading to his untimely death. It could also be that in a dark alternate universe, Tails is targeted and assassinated by an evil organization that wants to disrupt the balance of power in the world he lives in.
One possible plotline could be Sasuke discovers he's pregnant while on a solo mission. He then has to figure out how to deal with this situation while also hiding it from his enemies. Another could be that it's the result of some sort of magic or experimental jutsu gone wrong. He then has to face the reactions of his friends and family, especially Naruto, who might be shocked but also supportive.
One possible plotline could be Clary's friends finding out about her being tortured and launching a rescue mission. They might face many obstacles on their way to save her, like fighting off the torturers' guards.