Well, it could be because it offers unique and creative interpretations of existing fictional universes. Maybe the original characters (OCs) in it are really well - developed, with interesting backstories and personalities that draw readers in.
I don't think it's a common or widely recognized genre on its own. Fanfic genres usually revolve around more general themes like romance, adventure, or mystery. This seems like a very specific plotline within a particular fandom's fanfic collection.
Well, Kamui is the central figure, no doubt. In addition to him, an OC with special powers, like the ability to control elements, is often seen in these fanfics. A female OC who has a complex relationship with Kamui, whether it's friendship or something more, is also popular. And then there's the sidekick - type OC, a humorous and loyal character who is always there to support Kamui and provide some comic relief in the story.
No. Fanfic communities generally uphold certain ethical and moral standards, and a genre that involves elements like 'evil' in an inappropriate way, 'lemon' (which often implies sexual content), and'slave' (suggesting an unethical power dynamic) is not likely to be popular or acceptable.
One popular theme is the intense and often obsessive love of the yandere character. They might go to extreme lengths to protect or be with their 'love interest'. Another theme could be the conflict between the yandere's dark tendencies and the normal world around them. For example, in a school - based yandere oc fanfic, the yandere might try to eliminate any rivals in a rather cruel way while still trying to maintain a normal school - girl/boy facade.
A common plotline is the 'fish out of water' story. The OC could be a transfer student who is new to Akashi's world of intense basketball and strict discipline. This creates a lot of interesting situations as the OC tries to adapt and Akashi is intrigued by this new person. Another popular one is the 'forbidden love' plot. Maybe there are social or team - related reasons why Akashi and the OC shouldn't be together, but they can't resist their feelings for each other.
One popular Hamilton OC fanfic could be 'The Newcomer in Hamilton's World'. It might introduce an original character who interacts with the existing characters in unique ways, like getting involved in the political intrigues of the time. Another could be 'OC's Musical Adventure in Hamilton's Era' which perhaps focuses on an OC with a great love for music and how they fit into the musical - themed world of Hamilton.
One popular kancolle oc fanfic could be about an original character's journey through the naval battles in the kancolle universe. It might involve their unique abilities and how they interact with the existing characters from the game.
One popular OC is Aria. In the fanfics, she is a kind - hearted healer who attempts to heal Rumple's broken heart. There's also Damian, an OC that is a thief who gets caught up in Rumple's web of magic. And Sophia, an OC who is a fairy that tries to use her magic to counter Rumple's dark magic.
One popular 'leeteuk oc fanfic' might be the one where the original character (oc) goes on an adventure with Leeteuk in a fantasy world. It could involve them facing magical creatures together and developing a deep friendship along the way.