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.
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.
In many fanfictions, the corner serves as a symbol of a hidden connection between Snape and Hermione. For instance, there could be a corner near the Slytherin dungeons where Hermione gets lost and Snape finds her. Instead of scolding her, he helps her find her way back. This small act in that corner could be the start of a series of interactions that gradually change their relationship. It could also be a place where they have heart - to - heart conversations about their respective pasts and their place in the wizarding world.
Some writers might do it for the novelty. It's different from the traditional Hermione we know. It allows for a fresh take on her character and can lead to really unique storylines.
In some fanfictions, they leave because they might feel that Hogwarts has become a place full of danger and betrayal. For example, if there's a plot where Voldemort has infiltrated the school more deeply than expected, they would leave to protect themselves and find a new way to fight. Also, they could leave due to personal reasons like feeling ostracized by their peers or not agreeing with the way the teachers are handling things.
One fanfiction could be 'Moonlit Encounters'. In this, Hermione often steals glances at Remus and internally comments on his handsomeness. It shows their interactions in a Hogwarts setting, with Hermione blushing whenever Remus is around.
Some exist because it creates a really intense and dramatic conflict. Bellatrix is a very powerful and cruel character, and Hermione is a strong - willed heroine. Putting them in a situation where Bellatrix tries to break Hermione makes for a very engaging read.
Well, it could be to show different relationship dynamics. In the original story, they are very close friends. By having Harry leave Hermione, it can show how their friendship can be strained and how they might react to such a big change. It can also lead to new plotlines like Hermione having to form new alliances or Harry finding new friends in different places.
In some fanfictions, Hermione might be a gargoyle to explore a different side of her character. It gives a chance to show her adaptability. Maybe the author wants to put her in a situation where she has to rely on more than just her intelligence. As a gargoyle, she could face physical challenges that she's not used to as a human witch.
Some people like it because it's a pairing that breaks the norm. In the original 'Harry Potter' series, their relationship is mainly that of a strict teacher and a student. Fanfictions allow for a different kind of exploration, a 'what - if' scenario where they could be more than that.
Some Dramione fanfictions involve Ron leaving Hermione to create a new narrative space. By removing Ron from the Hermione - Ron relationship, it allows for a different dynamic to develop between Hermione and Draco. It gives the author a chance to explore new storylines that might not be possible with the traditional Hermione - Ron relationship intact. Also, it can be a way to add drama and conflict, as Hermione has to deal with the aftermath of being left, and Draco can be introduced as a new element in her life during this vulnerable time.