Magic gone wrong can also cause an angry mob. For example, if a wizard's spell has negative effects on the town like ruining crops or making people ill, the villagers will be angry and may form a mob to confront the wizard. Another reason might be the presence of a dangerous, otherworldly creature that the authorities are not doing enough to deal with. The people, fearing for their lives, could gather as an angry mob to take matters into their own hands.
One reason could be a corrupt ruler. If the leader is stealing from the people, raising unfair taxes, or abusing their power, the common folk might form an angry mob to demand change.
In some fantasy novels, the discovery of a long - hidden secret can cause an angry mob. For example, if it is revealed that the ruling family has a dark and evil origin, such as being descendants of a demon, the people who have been loyal to them may feel betrayed. This sense of betrayal can fuel their anger and turn them into an angry mob. They may feel that they have been deceived and used by the rulers, and now they want justice.
Another reason could be if someone were to slander or disrespect his late mentor, like Iruka or Jiraiya. Naruto holds these people in high regard, and any negative remarks or actions towards them would likely enrage him.
Another reason could be related to school work. If there are new rules in Hogwarts that she deems unfair regarding academics, like restrictions on library access or new grading systems that don't reward hard work properly. Hermione is all about learning and fairness in education, so this could really make her angry.
Perhaps there is some kind of external force or situation in the story world that makes the hero realize the importance of the mob character. For example, the mob character might have saved the hero's life in a very subtle way that the hero only just discovered. Or maybe the hero has seen the true nature of the mob character during a difficult time, like seeing their selfless side or their strong will, and this has led to his sudden decision to propose.
One reason could be Boruto's recklessness. In fanfiction, Boruto might engage in dangerous stunts or actions that go against Naruto's teachings. For example, if Boruto were to use a forbidden jutsu without fully understanding the consequences, Naruto would be angry as it not only endangers Boruto but also those around him.
In a fanfiction, Natsu might get angry if he was wrongly accused of something. Say, if he was blamed for a crime he didn't commit in the guild or in the magical world at large. He's an honest person, and being falsely accused would be a huge blow to his pride. Another possible reason is if a magic - based experiment went wrong because of someone else's carelessness and it put his friends in danger. Natsu values the safety of his comrades, and such a situation would make his blood boil. Also, if someone were to try and break up the Fairy Tail guild by causing internal disputes, Natsu would be enraged as he loves the unity and spirit of the guild.
One possible reason could be that Tsunade makes a decision regarding the village that Naruto strongly disagrees with. For example, if she refuses to send help to a neighboring village in need, Naruto, with his strong sense of justice, might get angry. He's always been about protecting and helping others.
One possible reason could be misrepresentation of her character. In some fanfictions, authors might change her personality to fit a certain plot, like making her overly jealous or mean, which would be out of character for the gentle Hinata. This could make her seem unlikable and thus anger fans who love the original Hinata.
One possible reason could be jealousy. Maybe Jackson has something Stiles wants, like popularity or a girl he likes. For example, if they both like Lydia, Stiles might get angry at Jackson's smooth ways with her.
One reason could be jealousy. If she sees her husband interacting closely with another woman at the party, she might get angry. Another reason could be that she feels neglected. Maybe her husband has been busy chatting with friends and not paying attention to her. Also, if she has had some pre - existing issues with her husband, the alcohol might make her more likely to blow up about them at the party.