His anger could also cause a rift within the group. His friends might be caught in the middle, not knowing whether to side with Harry or the Order. This could lead to some tension and arguments among them. Like Hermione might try to reason with Harry, but Ron could be more on Harry's side, causing a divide.
One possible consequence is that he might distance himself from the Order. He could stop following their instructions or even leave the group if he feels that his anger is not being addressed or if he believes that they are not changing their ways.
Well, perhaps in the fanfiction, the Order made decisions without consulting Harry. They might have put him in a dangerous situation without his knowledge, like sending him on a mission that seemed suicidal. It could also be that they were keeping secrets from him that he felt were important to his fight against Voldemort.
A consequence could be that Harry starts to feel a sense of alienation from the wizarding community. Since he is isolated by the Order, he might not be as in - touch with what's going on outside his isolation. This could lead to him making decisions based on incomplete information when he finally gets involved again. Also, his mental health might suffer as isolation can be very tough on a person's psyche, and he could become depressed or overly anxious.
The consequences of being angry included symptoms of cardiac arrest, irregular heartbeat, high blood pressure, cardiovascular disease, abnormalities of the digestive system, the occurrence of gastric ulcers, hormonal imbalance, damage to the immune system, decreased immunity, and the occurrence of diseases.
Another reason could be that Harry sees the Order as being too cautious or old - fashioned in their approach to fighting Voldemort. He might believe that their traditional methods are not enough to defeat Voldemort quickly and effectively, and this lack of progress makes him angry at them.
Maybe he feels that the Order is keeping secrets from him. In many fanfictions, Harry can be a character who values honesty and when he discovers that the Order, which he may consider an ally, is hiding things from him, it can make him angry.
In some fanfictions, Harry Potter might be angry at the Order because he feels they are keeping secrets from him. He is used to being in the thick of things and when the Order withholds information, it can make him feel left out and untrusted.
Edward might be punished in some way. Carlisle could restrict Edward's activities, like not allowing him to go to certain places or interact with certain people. This would be to teach him a lesson and make him understand the importance of following the family's rules and values.
One consequence could be that Harry becomes more isolated. If he hates the Order, he may distance himself from them, which means he loses a group of potential allies. This could put him in a more vulnerable position in the wizarding world.
In fanfiction, Harry Potter might be angry if his friends are in danger and no one seems to be taking it seriously. He's very protective of his friends, like Ron and Hermione. So if some authority figures in the story are being dismissive of the threats his friends face, that would surely make him angry.