One idea could be to create an OC who is a skilled hacker and gets involved with the Lagoon Company. The harem could consist of different female characters from the series who are attracted to the OC's intelligence and mysterious nature. For example, Revy might be intrigued by the OC's ability to get information that she can't through her usual violent means.
In Black Lagoon harem fanfiction, an interesting aspect is the power dynamics. Some fanfictions might explore how the male lead, who is often in a dangerous line of work, has his power either enhanced or complicated by the harem. The female characters in the harem may also have their own power bases, like their combat skills or connections. And the way these powers interact within the harem can lead to some exciting plot twists. For instance, a female character might use her connections to save the male lead from a difficult situation, but in return, ask for a greater role in his life, which then affects the entire harem dynamic.
Well, in Black Lagoon OC fanfiction, some might explore the idea of an OC who is a tech genius. This OC could create advanced gadgets to help in the various heists and battles that take place in the series. It could also be interesting to have an OC who has a moral code that clashes with the amoral world of Black Lagoon. Maybe an OC who tries to bring some form of justice to the city, even though it seems impossible. And then there are OCs that could be from different parts of the world, bringing in their own cultural elements to the story.
One idea could be the characters reacting to a modern-day action movie. They might be both amused and critical of the over - the - top stunts and special effects compared to their own gritty reality. For example, Revy could be making sarcastic comments throughout the screening.
The combination of the 'Black Lagoon' setting and the harem genre. 'Black Lagoon' is known for its gritty, action - packed world, and adding the harem element brings in new relationship dynamics. It's interesting to see how the tough characters from 'Black Lagoon' interact in a more romantic or complex relationship setting.
Perhaps a fanfiction could focus on Shenhua's past. Show how she became the skilled fighter she is in the present. It could involve her training under a strict master in a remote location and the events that led her to the Black Lagoon area.
Another plot could involve Balalaika having to protect a valuable artifact that has some connection to her past. This could draw her into a conflict with other powerful factions in Roanapur, all while she is haunted by the memories associated with the artifact. Maybe it was something she lost during a war and now she has a chance to regain it, but at great risk.
One idea could be Naruto being transported to the world of Black Lagoon. He might use his ninja skills in the gritty and dangerous underworld. For example, his shadow clone jutsu could be used for various heist strategies or in combat against the many dangerous foes in the Black Lagoon world.
One plot idea could be that Gretel and Rock are forced to team up during a dangerous mission in the criminal underworld of Black Lagoon. They have to rely on each other's skills, with Gretel's combat abilities and Rock's strategic thinking to get out alive.
A fanfiction could explore a scenario where Rock and Balalaika are stranded together in a remote location after a deal goes wrong. They have to rely on each other to survive, which is a huge change from their normal relationship in the show. As they struggle, they start to understand each other on a deeper level.
One idea could be exploring their past before they became the way they are in Black Lagoon. Maybe a story about their life in the facility where they were experimented on, and how they first started to form their unique bond.