Why would someone write a 'Harry dumps Ginny' fanfiction?

Yes, there are likely fanfictions with such a plot. Fanfiction writers often explore alternative relationship dynamics in the Harry Potter universe. However, this goes against the canon where Harry ends up with Ginny.

Well, some authors might want to explore different character arcs. By having Ginny dump Harry, they can show Ginny as a strong - willed character who is not afraid to make tough decisions. It also adds drama to the story, as the relationship between Ginny and Harry is a central part of the Harry Potter universe.

Well, perhaps in the fanfiction, Harry might feel that Hermione understands him on a more profound level when it comes to his role as the Boy Who Lived and his struggles with the wizarding world's future. Ginny, while she loves Harry, might not be as involved in those complex aspects. Also, the author might write it so that Hermione and Harry have a shared vision for the future of the wizarding community that Ginny doesn't share, leading Harry to choose Hermione.

There could be a story where Ginny dumps Harry because she feels overshadowed by his fame. In this fanfiction, Ginny starts to find her own identity and realizes she can't be in a relationship where she's constantly in Harry's shadow. So she breaks up with him, and the story could then follow how Harry tries to win her back but also respects her decision.

Some might write it to explore a different side of the characters. Maybe they want to see how the story would change if there was conflict between Hermione and Harry instead of their usual friendship.

Some writers might create 'Remus Hurts Harry' fanfiction to explore the darker side of the characters. It allows them to show that even beloved characters like Remus can have flaws and make mistakes that have serious consequences.

Well, some people might write it for shock value. They want to create something really out of the ordinary that will make readers go 'wow' or 'eww'.

Jealousy could be a reason. If Ginny sees Harry getting too close to another female character, she might lash out and hurt him with her words. For instance, if Hermione and Harry were spending a lot of time together on a project, Ginny might feel left out and say something mean.

A misunderstanding. Harry might say or do something that Ginny misinterprets. For instance, if he makes a comment about her Quidditch skills in a way she thinks is condescending. So, she punches him to show her displeasure. And then the story could unfold as they clear up the misunderstanding.

There's a fanfiction called 'Beyond the Breakup' which shows an alternate universe where Harry dumps Ginny due to his fear of Voldemort coming back and endangering her. In this story, Ginny becomes a strong, independent witch on her own journey of self - discovery. It has an interesting plot that keeps readers engaged.