What are some interesting plot ideas for a Harry Potter mermaid OC fanfiction?

Another plot could be that the mermaid inheritance gives the character a unique connection to the underwater world. This connection allows them to access a hidden part of Hogwarts that is submerged underwater and holds ancient secrets. As they explore this new area, they find clues about their family's past and the true nature of their mermaid inheritance, which also has implications for the future of the wizarding world.

One idea could be an OC who has a unique power that disrupts the normal mermaid song magic. For example, instead of harmonizing, their song creates chaotic waves. Another could be an OC mermaid from a far - off, undiscovered ocean realm who comes to the known mermaid world and has to adapt to different cultural aspects of mermaid song. A third idea is an OC who is half - human, half - mermaid and struggles to find their place in both worlds while also having a special ability related to their mixed heritage and mermaid melodies.

Another plot could be that the OC is an outcast in the wizarding world due to their unorthodox magical abilities. They see Harry as a kindred spirit. When they adopt him, they take him on a journey to discover the true nature of magic, which is different from what is taught at Hogwarts. This could involve exploring hidden magical realms and learning from magical creatures that are not well - known in the wizarding community.

One idea could be that the OC is a transfer student from a far - off magic school. The harem could consist of characters from different houses. For example, Hermione could be attracted to the OC's vast knowledge of ancient magic that he or she learned from their original school. Ginny might be drawn to the OC's brave and adventurous spirit, similar to Harry's. And Luna could be interested in the OC's unique view of the magical world, which is different from Hogwarts' norm.

A possible plot is that the Gaunt OC is an outcast within the family due to their different views on magic. They believe in a more inclusive form of magic that accepts all wizards and witches regardless of blood purity. So, they run away from the Gaunt family and end up at Hogwarts. There, they face discrimination from some Slytherins who know of their family name, but they find friends among the other houses and together they try to change the perception of blood purity at Hogwarts.

One idea could be a male oc who is a transfer student from a different wizarding school. He has unique magical abilities that are rare in Hogwarts, like the ability to communicate with magical creatures on a deeper level. This could lead to him helping Hagrid with some of the more dangerous creatures and getting into all sorts of adventures around the Forbidden Forest.

One idea could be that the OC is a foreign exchange student who has unique magical abilities unknown to Hogwarts. They could help Harry in the Triwizard Tournament tasks in unexpected ways, like using ancient spells from their home country.

One idea could be a mermaid OC who discovers a hidden underwater civilization. This mermaid, with her unique abilities, could be the key to unlocking the secrets of this long - forgotten place.

Well, an interesting concept for a Harry Potter OC fanfiction could be an OC who is a time - traveler. They could go back in time and interact with the founders of Hogwarts, or forward in time to see the future of the wizarding world. Also, an OC that is a magical creature hybrid, half - human and half - something like a centaur or a mermaid, could bring a lot of unique storylines. Additionally, an OC who is a secret heir to one of the old wizarding families and has to navigate the politics and secrets of that family would be really engaging.

Well, an interesting plot for a Harry Potter oc fanfic could be an OC who discovers a hidden chamber in Hogwarts that has been sealed off for centuries. This chamber could hold the key to a powerful magic that could change the balance between good and evil in the wizarding world. Or perhaps an OC who has the power to see the future in their dreams but doesn't understand it at first, and they keep having these strange dreams that seem to be related to Voldemort's return. They then have to figure out what it all means and how to use this power to help their friends.