Another reason could be that Harry has other priorities in the fanfic. He may be more focused on solving a mystery, helping a friend, or achieving a personal goal that doesn't involve fighting. So, fighting is not on his agenda.
One possible reason could be Snape's unfair treatment of Harry and his friends. Snape often showed blatant favoritism towards Slytherin students and was overly harsh on Gryffindors, especially Harry. This constant bias could lead Harry to want him fired. Another reason might be Snape's connection to the Dark Arts. Harry, having faced Voldemort, might be worried about Snape's knowledge and use of dark magic within Hogwarts. Also, Snape's generally unpleasant demeanor towards students could be a factor. His sarcastic remarks and cold attitude might make Harry think that he is not a suitable teacher for Hogwarts students.
One possible reason could be jealousy. Maybe Hermione gets jealous of Harry's popularity or his special connection with other characters. Another reason might be differences in their approaches to solving problems. Harry could be more impulsive while Hermione is more methodical, leading to clashes. For example, in a situation where they need to rescue someone, Harry might want to rush in without a proper plan, but Hermione would insist on having a well - thought - out strategy first.
One possible reason could be jealousy. Maybe Ginny gets jealous of Harry's friendship with Hermione. Another reason might be differences in their future plans. For example, Harry may want to focus on his Auror career more than Ginny anticipates, causing a rift between them.
One reason could be that he wants to experience a normal life. In the wizarding world, he is constantly in the spotlight as 'The Boy Who Lived'. At a Muggle school, he might be able to blend in and just be an ordinary kid for once.
One possible reason could be that Harry has grown tired of the cycle of violence. He might have seen how much destruction the fight has already caused and decides that there has to be another way. Maybe he believes that by refusing to fight, he can break the pattern and find a more peaceful solution to end Voldemort's reign of terror.
One reason could be that Hermione is a strong - willed character. In fanfiction, Ron might be depicted in a way that undermines her independence. She wants to be seen as her own person, not just as Ron's love interest.
It could be that he has some personal traumas related to fighting. For example, he might have seen the negative consequences of fighting in the past, such as the loss of loved ones or destruction of places he cares about, so he refuses to engage in it. In addition, he may also be influenced by certain moral or ethical beliefs within the context of the fanfic's world, which lead him to oppose fighting.
They could fight due to a prophecy. If there's a prophecy that involves one of them being the 'chosen one' and the others think they should be, it would create a lot of tension. For instance, if the prophecy says that only one of them can save the world from a certain doom. Percy, being the main character in many stories, might be assumed by the others to be the one, but Thalia and Nico may believe they have just as much right. Their struggle for that role could lead to a fight. And during the fight, they would use their unique abilities. Percy would call upon the water, Thalia would summon her lightning bolts, and Nico would raise the dead to fight on his behalf.
Another reason could be different loyalties. Thalia has her own group of friends and allies, and Percy has his. There could be a situation where their friends' actions or needs put them at odds with each other. For example, if Percy's friends get into trouble with something related to Thalia's friends' territory or interests, it could spark a fight.
It could also be that Harry Potter in fanfiction is a more self - reflective version of himself. He has already been through so much in the original series that he has grown tired of fighting. He may realize that there are other ways to resolve conflicts, such as through dialogue and understanding, rather than resorting to physical or magical combat as is often depicted in fanfiction.