One interesting merman OC could be a merman who has a special connection to the Black Lake at Hogwarts. He might be a guardian of sorts, protecting the magical creatures in the lake from dark wizards. His appearance could be a blend of traditional merman features like a fish - like tail with unique magical markings.
They can fit in through relationships. A merman OC could befriend students or teachers at Hogwarts. Maybe a merman forms a bond with Hagrid, who is known for his love of all creatures. This friendship could lead to adventures where the merman's knowledge of the underwater world and Hagrid's knowledge of the Forbidden Forest combine in unexpected ways.
One interesting HP OC fanfiction could be about an OC who is a muggle - born witch with a special talent for healing magic. She enters Hogwarts and has to deal with the prejudices of some pure - blood students. Another might be an OC that is a half - vampire and half - wizard, creating a whole new set of challenges and adventures within the wizarding world. There are also those where the OC is a time - traveler, going back in time to change certain events in the wizarding history.
Love is a very common theme. Often, it's about a merman OC falling in love with a human or another merman. Another common theme is adventure. Merman OCs usually go on some sort of journey, whether it's exploring a new part of the ocean or trying to reach the surface world.
One idea could be to explore what would happen if the Little Mermaid had a different power, like the ability to control storms. Another could be a story where she meets a merman from a different part of the ocean who has a completely different culture. Maybe a fanfiction where she has to save the entire ocean from a new kind of threat that no one has ever seen before.
Well, 'Merman's Tale' is quite popular. In this fanfiction, the merman OC is a prince of the underwater kingdom. He goes on a journey to the surface world to find a cure for a strange illness that is affecting his people. It has some really cool descriptions of the underwater and surface worlds. Also, 'The Lost Merman OC' is good. It's about a merman OC who gets lost in a far - away part of the ocean and has to find his way back home, meeting various interesting characters along the way.
Well, a popular type of hp crossovers fanfiction is the one that crosses it with the DC universe. Superman or Batman in the wizarding world would be quite a sight. They could use their unique skills along with the magic of HP. And then there are the crossovers with the Chronicles of Narnia. The idea of the Pevensie children and Harry Potter interacting in their respective magical worlds is really interesting.
Maybe Harry is the only merman in a world where mermaids are common. He faces discrimination at first but then uses his unique abilities to save the underwater kingdom from a great danger. For example, he might have a special power to purify poisoned waters that the mermaids don't have.
One idea could be that the little merman discovers a hidden underwater kingdom full of magic and mystery. He could be on a quest to find a powerful artifact that can save his own kingdom from a dark force. Another plot could be a love story where he falls in love with a human who can also breathe underwater due to a special spell.
Well, a cool plot might be that there's a merman who has a special power to control water currents, and Percy needs his help to find a lost magical artifact deep in the ocean. In return, Percy has to help the merman get accepted by the surface - dwelling gods. Or perhaps a merman is wrongly accused of stealing Poseidon's trident and Percy has to prove his innocence.
One interesting plot could be Percy struggling to adapt to his new merman form. He might have to learn how to swim with a tail instead of legs, which could lead to some comical and challenging situations. For example, he could accidentally crash into coral reefs while trying to master his new swimming skills. Another plot could involve Percy trying to hide his merman identity from his friends at first, fearing their reaction. This could create a lot of tension and mystery in the story.