You could create an alternate universe where the main characters have different abilities or occupations. Maybe the detective is a magician instead, and uses magic to solve cases, adding a whole new layer of intrigue to the story.
One of the main themes could be mystery. Since it's in the title'mysterious', it likely involves a lot of puzzling cases and secrets waiting to be uncovered. Another theme might be adventure as the characters presumably go through various events to solve the cases related to the lotus. Also, there could be elements of friendship or loyalty as they might work together to face the challenges in the story.
Since it's a Mysterious Lotus Casebook Novel, there might be a character who has a special connection to the lotus. This person could be the protagonist, perhaps a scholar or an investigator who is intrigued by the lotus for some reason. There may also be an antagonist, someone who wants to use the lotus for their own evil purposes or is trying to hide the secrets about it. And of course, there could be other supporting characters like local villagers or other experts who help the main character in the investigation.
First, really study the original work. Pay attention to the characters' personalities, the setting, and the overall tone. This will help you stay true to the essence of the Mysterious Lotus Casebook.
One idea could be to explore the backstories of the minor characters in more detail. For example, we could learn more about the early life of Mr. Benedict himself, like how he discovered his unique intelligence and what led him to form the society.
Well, you could write a fanfiction where they go on a trip together. This would be a great opportunity to put them in new and different situations. For example, they could end up in a small, strange town where the girlfriend's mysterious nature seems even more pronounced. Maybe she has some sort of connection to the town's history or an old legend there.
One idea could be exploring the backstories of the minor characters in more detail. For example, what was Mr. Benedict's life like before he formed the society? Another could be a time - travel plot where the members of the society go back to a key moment in the series' history to change something. Maybe they could prevent a certain event that led to one of their hardships.
One idea could be that Percy discovers a hidden passage in the Lotus Casino that leads to a different era of the casino, like the 1920s version filled with flapper - style gamblers. Another could be that he has to break a curse on some of the casino guests who have been trapped there for decades by a malevolent spirit. Maybe he teams up with a new demigod he meets in the casino, who has a special power related to chance, to outwit the casino's magical traps.
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One idea could be exploring what would happen if the Thundermans lost their powers permanently. It would completely change their dynamic and how they interact with the world and villains.
Some interesting Ghostbusters fanfiction concepts could be centered around the ghosts themselves. For instance, a story where a particular ghost has the ability to possess inanimate objects and uses this power to create chaos in the city. The Ghostbusters would then have to figure out how to stop it without causing too much destruction. Another concept could be a time - travel fanfiction where the Ghostbusters go back in time to prevent a major ghost - related disaster from ever happening. This could involve meeting their younger selves or influencing key events in the past related to the supernatural.