Some might do it to explore different character arcs. By making Ginny mean, they can show how Hermione reacts and grows in response to such treatment. It gives the writer a chance to deviate from the original friendly relationship between them in the books and explore new storylines.
One reason could be to add more conflict. Fanfiction writers often want to create more drama in the story, and having Ginny be mean to Hermione can stir things up.
It could be for aesthetic reasons. Green is often associated with nature, growth, and magic, which all fit well with the Harry Potter universe. Hermione, being a powerful witch, wearing green can symbolize her connection to these elements.
In many fanfics, Hermione often acts as the rational one. She might initially be a bit skeptical of Luna's more far - out ideas, but then comes to see their value. Ginny is usually the bold one, and she encourages Hermione to be more adventurous. For example, in a story where they explore a hidden part of the Forbidden Forest, Ginny is the first to step forward, while Hermione hesitates until Luna's calm words convince her.
In some fanfictions, Ginny might be portrayed as mean to Hermione out of jealousy. For example, over their relationships with Harry. However, this is not in line with the original series where they are friends. Fanfiction often takes creative liberties.
They are popular because they are both strong female characters. Ginny is brave and talented in Quidditch, while Hermione is extremely intelligent. Their different strengths make for interesting combinations in fanfiction stories.
Some people write them because they see a potential for a unique relationship between Hermione and Ginny. They might feel that their personalities complement each other well and want to explore a romantic aspect of that.
Well, some fans might create such fanfictions to explore different relationship dynamics. Maybe they want to show a more complex side of Harry, like he's so focused on his fight against Voldemort that he unintentionally ignores Ginny. It could also be a way to add some drama and angst to the story.
It could also be because fans want to see a different kind of harmony. In the original story, there were some unspoken feelings and strong bonds between all three of them. Writing a fanfiction where Harry marries Ginny and Hermione allows fans to create a world where all those feelings are resolved in a way that satisfies their own ideas of a perfect ending. It gives them a sense of control over the story and the characters' fates, and they can make it as magical and heart - warming as they like.
Friendship is a very common theme. They are often depicted as supporting each other through thick and thin, whether it's during their time at Hogwarts or in their adult lives. Another theme is female empowerment. Hermione and Ginny are strong - willed characters, and fanfictions usually show them being independent and making important decisions.
One possible reason could be for the sake of creating drama. In many fictional works, conflict is key to driving the story forward. By having Ginny hate Hermione, it can stir up all sorts of situations, like jealousy over Harry perhaps. Ginny might be jealous of Hermione's close friendship with Harry, which could lead to some interesting storylines.
Fans write these fanfictions because they love the relationship between Harry and Ginny. Their relationship in the original books has a lot of potential for further exploration, especially the more romantic and intimate moments like snogging.