Who could be the main characters in 'My child not yours Harry Potter fanfiction'?

Well, it could be about a character in the Harry Potter world who discovers that a child is theirs and not someone else's. Maybe it's a story of a wrong assumption of paternity, and the real parent has to fight to claim the child. For example, a wizard who was wrongly thought to be the father by another wizard, and through a series of magical adventures and revelations, the truth comes out.

Harry Potter would definitely be one of the main characters, since it's about him being the 'child of death'. There might also be his friends like Hermione and Ron, as they are often involved in his adventures.

It's possible that the main character is the 'dark child' of course. There could also be a mentor - like figure, maybe an older wizard who tries to guide the child towards the light. And it wouldn't be surprising if there were some antagonists as well, such as other dark wizards who want to use the child's power for their own evil purposes.

It's difficult to determine exactly, but if the fanfiction focuses on the concept of the 'child of the green' being a new addition to the wizarding world, then that character would be central. There could also be other important characters like Draco Malfoy. Since Draco is from Slytherin, his path might cross with the 'child of the green' in interesting ways. And of course, we can't rule out the possibility of some magical creatures being significant characters in this fanfiction as well, like a magical snake or a forest - dwelling creature, considering the 'green' theme.

Obviously, the child is one of the main characters. There might also be some prison guards who play important roles, either as antagonists or those who gradually change their views towards the child. And perhaps some other inmates who interact with the child could also be considered main characters.

There might also be appearances by Harry Potter and his friends. Since it's a fanfiction related to the Harry Potter universe, they could play important roles, either as mentors to the Rose Child or as characters who are initially suspicious of the Rose Child but then come to understand them. Hermione, with her vast knowledge of magic, could be helping the Rose Child understand their powers better. Ron could be the one who provides some comic relief during tense situations involving the Rose Child.

Harry and Hermione could be the main characters. They have a strong friendship in the original series, and a fake wedding between them could create an interesting dynamic. It could explore how their relationship changes under the pretense of marriage, and how they deal with the reactions of others like Ron.

Maybe the main villain could be a corrupted Hogwarts professor. This professor could be secretly teaching dark magic to students and when Harry's child discovers this, they become the target. The professor wants to stop the child from revealing their dark secrets and will go to great lengths to do so, making them a formidable villain in the fanfiction.

It could be a distant relative of Voldemort who has been biding their time in the shadows. They might have a vendetta against the Potter family for what happened to Voldemort. This relative could be secretly gathering followers and planning to strike at the second child when they least expect it.

I'm sorry, without reading the fanfiction it's hard to say for sure. But it could be an original character created for this story, along with some well - known Harry Potter characters like Harry, Hermione, or Ron who interact with this new character.