The court sorcerer, if there is one in the fanfiction, might be a cause. If the sorcerer is jealous of Merlin's natural power and tries to undermine him at every turn, constantly challenging and insulting Merlin, it could lead to Merlin losing his temper in the face of such constant harassment.
Arthur could be the cause. He often bosses Merlin around and doesn't fully understand Merlin's capabilities. His constant demands and lack of respect for Merlin's intelligence might push Merlin to the edge. For instance, when Arthur makes Merlin do dangerous and pointless tasks without any regard for his safety.
One possible scenario could be when Merlin is constantly underestimated in Camelot. People might make fun of his clumsy appearance or dismiss his ideas. After a series of such incidents, he loses his temper. For example, if Arthur repeatedly ignores Merlin's warnings about a coming danger and then blames Merlin when things go wrong, Merlin might snap.
His own self - doubt could be the cause. Percy might be constantly thinking that he's not good enough to protect his friends or complete his quests. And one small trigger, like a friend making a harmless joke about his capabilities, could make him lose his temper because it hits too close to home.
It could be Draco Malfoy. Malfoy is always taunting Harry and his friends. His constant insults and attempts to undermine Harry might finally push Harry over the edge and make him lose his temper.
Rosalie might initially be taken aback. Since she is used to being in control and having a certain level of respect, Bella's outburst could shock her. She might just stand there for a moment, not knowing how to respond immediately.
It could also be due to a misunderstanding. Rosalie might say or do something that Bella misinterprets. Say, Rosalie gives some advice about Bella's relationship with Edward, but Bella takes it the wrong way, thinking Rosalie is trying to interfere in a negative way and thus loses her temper.
One possible reason could be that he's constantly being underestimated or not given the credit he deserves. In some fanfictions, his friends might take his contributions for granted, which could lead to his temper flaring up.
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He might accidentally reveal his identity. In some fanfictions, when Peter Parker loses his temper, he can't control his actions or words as well. This could lead to him slipping up and showing his superpowers in front of the wrong people, which would put his secret identity at risk.
Once there was a boy named Tom. He had a short temper. One day at school, a classmate accidentally bumped into him in the hallway. Tom immediately lost his temper, shouting at the poor boy. His face turned red and his fists clenched. But later, he realized his mistake and apologized.
Another reason could be her relationships. If she has a fight with a friend or a love interest. Let's say she and Edward had an argument over his over - protectiveness. That could easily make her lose her cool.