There might be a 'Harry Potter Christian fanfic' that reimagines the Hogwarts houses with a Christian perspective. Maybe Gryffindor represents the brave believers, Hufflepuff as those with a pure and kind Christian heart, Ravenclaw as the seekers of spiritual knowledge, and Slytherin as those who need to be redeemed through Christian values.
Some 'Harry Potter Christian fanfic' could focus on the idea of redemption. In the original series, many characters have a journey of redemption, like Draco Malfoy. In a Christian - themed fanfic, this could be explored more deeply in the context of Christian concepts of forgiveness and grace.
There might be fanfictions where the magic in the Harry Potter world is re - interpreted through a Christian lens. Maybe the magic is seen as a gift from God, and the wizards have a responsibility to use it in a way that aligns with Christian teachings, like helping the poor and the oppressed. Some stories could explore how Hogwarts could incorporate Christian - based ethics in its curriculum.
There are 'Harry Potter fanfic fanfic' that focus on time - travel scenarios. Imagine if a character from the later books travels back in time to the first year at Hogwarts. This can create a lot of interesting plot twists as they try to change or preserve the original story line. Also, some fanfic fanfic might center around magical creatures in a way that wasn't fully explored in the original books, like the life of a hippogriff in more detail.
Some 'Harry Potter and Lily Potter fanfic' might focus on alternate universes. In one such story, Lily could have survived Voldemort's attack. She would then have to raise Harry in a world that is still recovering from the Dark Lord's first rise. This would change a lot of the dynamics in the story. Harry would grow up with his mother's love and protection, and Lily would have to deal with the knowledge that Voldemort could return at any time.
Another concept could be that Christian Grey somehow gains magical powers and attends Hogwarts. He could use his charm and dominance in a different way among the students and teachers, perhaps even getting into a power struggle with Snape.
I'm not really in favor of the 'slaves' concept in fanfic as it can be a bit disturbing and against the positive spirit of the original 'Harry Potter' series. However, some fanfics might explore power dynamics in a more metaphorical way. But overall, the official 'Harry Potter' works focus on friendship, courage and magic, not slavery themes.
One interesting 'Harry Potter breed fanfic' story could be about the breeding of Hippogriffs in a more domesticated setting. Maybe it explores how wizards are trying to train them for various tasks like mail delivery in a different way than using owls.
One interesting 'Harry Potter Siren Fanfic' could be about a siren who uses her charm to influence the events at Hogwarts in a subtle way. Maybe she befriends Harry and tries to guide him through some challenges using her siren - like powers, which are different from magic but still effective.
There might be a fanfic where a MACUSA auror teams up with a Hogwarts student. They could be working together to stop a dark wizard who is causing chaos in both the American and British wizarding worlds. The story could explore how their different magical educations and approaches to magic come into play.
One interesting 'Harry Potter glutton fanfic' could be about Harry discovering a magical kitchen that creates endless amounts of his favorite wizarding treats. He goes on a bit of a food - filled adventure, trying all sorts of new and old magical delicacies.