In the 'Harry Gets Angry' fanfiction, Harry might get angry when his reputation is smeared. He has always been in the spotlight, and false rumors can really get to him. Also, seeing the weak or the underdogs being bullied can make him angry. He has a strong sense of justice, so any form of oppression or unfair treatment towards others can stir his anger as well.
He might lash out with his magic. For example, he could send a spell flying at the source of his anger without really thinking. Sometimes, he just glares intensely, his green eyes filled with fury. And he may raise his voice, shouting at those who have angered him.
One common reason is Hermione's over - protectiveness. Sometimes she tries to control situations too much, which can make Harry feel suffocated and thus angry. For example, in some fanfictions, she might try to stop Harry from taking risks in a dangerous mission, which he sees as her not believing in his abilities.
Lack of control is another factor. When the characters in Lab Rats, like Adam with his super - strength, feel that they can't control their powers or the situation around them, it can lead to anger. This is often used in fanfiction to show the internal struggle of the characters and how they deal with their own limitations.
It could be due to a misunderstanding. Perhaps someone spread false rumors about him, and as a result, people started treating him differently. He might be angry at everyone because he feels that no one bothered to find out the truth from him. Also, if there were some new rules or restrictions imposed on him without proper explanation, that could fuel his anger.
One possible reason could be that Harry has been spending too much time on his heroic duties and not enough time with Ginny. Another might be that he made a decision without consulting her, like taking on a particularly dangerous mission. It could also be something as simple as he forgot an important date or anniversary.
It could lead to a lot of conflict. His friends might try to reason with him, but if he's too angry, he might push them away. This could split their group apart, creating new alliances or just leaving Harry isolated for a while. His anger can also attract the attention of the wrong sort of people, like those who want to use his emotional state for their own gain.
He might be confused at first. Harry isn't always the quickest to understand Hermione's motives right away. So he could just stand there, looking at her with a puzzled expression on his face, not really knowing what he did wrong.
One common trigger is seeing the Dark Mark. In fanfictions, just the sight of it can send Harry into a state of panic as it reminds him of the Death Eaters and the chaos they caused in Order of the Phoenix. Another trigger could be the sound of certain spells that were used during the battle at the Ministry, like the Cruciatus Curse.
His anger often manifests physically. His muscles might bulge more than usual, and his hair could stand on end even more in his Super Saiyan forms. His ki, or energy, also becomes more visible and intense. It's like a red - hot aura surrounding him.
One possible reason could be that Erza might have taken on a dangerous mission alone without informing Natsu. Natsu is protective of his friends and would get angry if he thought Erza was putting herself in unnecessary danger.