There might also be new characters created specifically for this fanfiction. Maybe a young, talented witch or wizard who Harry discovers and brings into the Order. This new character could bring fresh ideas and a different perspective to the group, while also having their own story arc within the fanfiction.
Another plotline could involve Harry's relationships within the Order. He has to deal with different personalities and egos. There could be conflicts and reconciliations as he tries to keep everyone united towards the common goal of defeating Voldemort. He might have to make tough decisions regarding who to trust and who not to.
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.
Maybe he has read some really bad Order fanfictions before that were full of inaccuracies. For example, the characters' personalities were completely distorted or the plot was so far - fetched that it made him lose trust in all Order fanfictions.
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.
Maybe in the fanfiction, the Order has some actions that Harry disagrees with. For example, they might be too controlling over his life and decisions. Harry is a very independent person, and if the Order tries to restrict his freedom in the story, it could lead to his hatred.
Some members may be immediately welcoming and eager to assist. They recognize Harry as an important figure in the fight against Voldemort and understand his need for support.
Well, it could be about many things. It might focus on a new order within the wizarding world in the Harry Potter universe. Maybe it's about a group that uses the power of order to fight against dark forces. It could also explore how this power of order affects the characters we know, like Harry, Hermione, and Ron.
One common theme is the exploration of their relationship. Since they don't have a major relationship in the original books, fanfiction often delves into how they could get closer, whether it's through shared magical interests or facing a common enemy.