One possible plot could be that Izuku has been through a really traumatic experience that has changed him. He starts to isolate himself and when people try to approach him, he acts in a way that scares them off. He could have developed some sort of survival - based aggression. For instance, if he was trapped in a really dangerous situation where he had to fight to survive, he might now react harshly to any sudden movements or people getting too close to him, which would scare his friends and classmates.
His classmates like Bakugo could be a main character. Bakugo might be one of the first to notice the strange changes in Izuku and could be both scared and angry about it. He might try to confront Izuku, which could lead to some intense scenes.
Perhaps in the fanfic, Izuku is possessed by some dark entity which changes his behavior and makes him do terrifying things, causing fear among his friends and foes alike. For example, his actions might be unpredictable and seem dangerous to those who know him. He could start speaking in strange voices or have sudden outbursts of strange powers that startle everyone. This would lead to a situation where everyone is scared of him, and the story could revolve around how he tries to get rid of this possession or control this new and scary side of himself.
His friends from U.A. High School such as Bakugo, Ochaco, and Iida would also likely be main characters. Since Izuku is scaring everyone, they would be the ones experiencing the fear and trying to figure out what has happened to him. Their reactions and attempts to deal with the situation would be important parts of the story.
In the fanfiction, Naruto could have been possessed by some dark force. This dark - Naruto then starts to act in a very unpredictable and scary way, like randomly attacking people with great force. He might also have a really creepy look in his eyes, which scares everyone around him. The villagers who once knew Naruto as a friendly ninja would be shocked and terrified.
His close friends like Sasuke and Sakura would likely be among the most affected. They know Naruto well and seeing him in a terrifying state would be very shocking for them. For Sasuke, who has a deep bond with Naruto, it would be especially hard to face a scary Naruto.
Since I'm not overly familiar with this specific fanfiction type, it could potentially include themes of fear, power dynamics. Maybe Percy has some sort of power or ability that he uses to intimidate or 'scare' Misery.
He would likely be more confident. Having the powers of the Human Torch gives him a new level of strength. So he might stand up straighter and be more assertive in his actions.
Well, finding 'percy scares misery fanfiction' might be a bit tricky. First, you need to understand the themes and characters in both 'Percy' and 'Misery' (assuming they are from some known works). Then, look for fanfiction communities where people might be writing crossovers or stories with this concept. Maybe start with general fanfiction forums and ask if anyone has come across such a thing.
One interesting story could be where Edward's attempt to protect Bella in a 'scary' way actually leads to a deeper understanding between them. For example, he might overreact to a potential threat in the vampire world, which scares Bella at first but then she realizes it's his way of showing love.