It's possible that in the fanfiction, there are rumors or stories about the divination classroom or the subject itself that put Harry off. For instance, if there are tales of strange happenings during divination classes that make Harry uncomfortable, he would choose not to take it. Also, his friends might influence his decision. If Ron and Hermione are not fans of divination, Harry might be more likely to skip it too.
The fanfiction writer may want to show Harry's independence. By not taking divination, which is a rather traditional Hogwarts subject, Harry is breaking away from the norm and following his own path. He might be more interested in learning about magic that has a more immediate and tangible impact, like spells for combat or protection. So, divination just doesn't appeal to him in the context of the fanfiction.
One reason could be that Harry simply doesn't believe in divination as a useful subject. He might think it's all just superstition and not something practical for his goals at Hogwarts.
One reason could be that he's desperate for any form of guidance. After all the chaos he's been through, divination might seem like a way to get some answers about the future. It's like grasping at straws, but it could be important to him.
Maybe he doesn't trust the teacher, Professor Trelawney. Her rather flamboyant and often inaccurate predictions might have put Harry off. He could see that her teaching methods lack the sort of solid foundation he looks for in a class, especially compared to more reliable professors like McGonagall.
Well, sometimes authors want to create a shock factor. By having Snape take advantage of Hermione, it would be a very unexpected and controversial plot twist. Also, it could be due to a lack of understanding of the characters' personalities. Snape is a proud and somewhat noble character in his own way, and Hermione is not a weakling. So this idea might come from not fully grasping their essence.
One reason could be that Batman is written as being too self - absorbed in the fanfic. He might be so focused on his own mission that he doesn't want the distraction or responsibility of taking in Robin.
One reason could be copyright infringement. The official Harry Potter franchise owns the rights to the characters, settings, and storylines. Fanfiction might use these elements in ways that violate the official rights. For example, if a fanfiction writer tries to make money from their work using Harry Potter elements without permission. Another reason could be to protect the brand's integrity. If a fanfiction contains offensive or inappropriate content related to Harry Potter, it could damage the overall positive image of the franchise.
In fanfiction, their kiss might be a way to break free from the expectations placed on them. Harry is always seen as the hero and Draco as the villain's sidekick. By kissing, they are defying those roles and expectations. It could also be a way to gain power over each other in a different sense. Instead of the usual power struggle based on magic or family name, the kiss becomes a new form of power dynamic between them.
One reason could be to explore the darker side of human nature. Even though Harry is a hero in the original series, fanfiction writers might want to see how he would be affected if he was pushed to his limits. Another reason is to create a more complex and controversial storyline. It grabs readers' attention as it goes against the normal perception of Harry.
One possible reason could be a misdirected spell during a battle. In the heat of a fight, Harry's spell could go awry and accidentally kill Malfoy. Another reason might be if Malfoy was under the control of a dark wizard and was about to do something truly terrible, and Harry had to stop him at all costs, including taking his life.
Perhaps the story is set in an alternate universe where Harry has different abilities or personality traits. For instance, he might be more of a loner or less interested in leading groups in this version, so he doesn't lead the DA.
One reason could be that the fanfiction is set in a different universe where the characters' personalities are slightly altered. So, this 'new' Harry just doesn't click with Ginny in that version. For instance, if the fanfic is a darker take on the story, Harry might be more jaded and not open to a relationship with Ginny.