Hermione could be one. Given her open - mindedness and thirst for knowledge, she might be intrigued by the Demons Child and see its potential for good rather than just being scared of it.
One idea could be exploring the relationship between the new character, the Demons Child, and the existing Hogwarts students. Maybe the child has unique powers that both intrigue and frighten others.
Magic and demons are the key. In these fanfics, the magic of the Harry Potter world combines with the idea of demons. For instance, spells might be used to fight or control demons.
Well, it could be about Harry Potter having to face a new kind of dark magic related to the demon's soul. Maybe he discovers a hidden artifact that is infused with the demon's soul and has to figure out how to destroy it without getting corrupted himself.
One popular 'Harry Potter Demons' fanfic could be 'The Demon's Mark in Hogwarts'. It often explores the concept of demons in the magical world of Harry Potter in an interesting way.
In a Bellatrix and child Harry Potter fanfic, the author might explore the idea of Bellatrix having a change of heart towards Harry. It could start with her seeing some of James Potter in the young Harry. This could lead to a series of events where she tries to protect Harry from other Death Eaters, which would be a huge deviation from her character in the original series. However, it would make for a very interesting and unique fanfic.
It could be a fanfiction that focuses on the idea of a character in the Harry Potter universe remaining a child forever. Maybe it explores how that character's eternal childhood affects their relationships, their magical abilities, or the overall plot of the story.
Definitely not. J.K. Rowling created a magical world full of wonder and positive themes. The concept of a child bride has no place in this world. It would be a perversion of the original story and its intended audience, which is mainly children and young adults who are supposed to be inspired by the good values in the books.
Maybe the demon's soul itself could be the main antagonist in a way. It has its own will and desires, which are mainly to spread chaos and destruction. It could possess other characters in the story and make them act against Harry. For instance, it might possess a Hogwarts professor who then tries to undermine Harry's efforts to stop it. The demon's soul's ability to manipulate and corrupt would make it a very dangerous and menacing antagonist.
In writing this fanfic, dialogue is crucial. Bellatrix has a distinct way of speaking, often with a manic and cruel edge. Harry, as a child, would be more innocent yet determined. Their conversations should reflect their personalities. Also, consider the impact of other characters. How would Dumbledore react if he found out Bellatrix was involved with Harry? Incorporating these elements will make the fanfic feel more like a legitimate part of the Harry Potter universe.