Another idea for a 'Harry Potter Banks Fanfic' is a story where the goblins who run the banks go on strike. This causes chaos in the wizarding world as people can't access their money or their family heirlooms. Harry and his friends could get involved in trying to negotiate between the goblins and the wizarding authorities to end the strike and restore order to the banks.
One interesting Outer Banks fanfic could be one that focuses on the backstories of the characters. For example, a story that delves into John B's life before the events of the show, like his relationship with his father when he was younger. Another could be a fanfic that gives a different ending to the series, perhaps where the group doesn't find the gold but discovers something even more valuable. There are also fanfics that might explore romantic relationships between different characters in more depth than the show does.
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.
Well, Harry Potter himself would likely be a main character. His experiences with Gringotts and the wizarding banks are well - known, so he could be involved in any number of bank - related adventures in fanfic. Hermione Granger could also be a main character as she's always interested in learning about the inner workings of the wizarding world, including the banks.
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.
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.
There could be a 'Harry Potter betrothed fanfic' where Harry is betrothed to a new character created by the author. This new character might be from a different magical family. The story could then revolve around Harry learning about this new family's traditions and trying to blend them with his own life at Hogwarts.