One idea could be to create an OC who is a detective from a different region, like Unova. They could have a unique Pokemon partner, like a Zorua that can transform and help with investigations in sneaky ways. Their backstory could involve coming to Ryme City to learn new detective techniques.
First, start with a strong hook. For example, your OC could witness a strange Pokemon phenomenon at the start. Then, introduce the main conflict, like a missing or mutated Pokemon. Build the plot around your OC's journey to solve the mystery, with various obstacles along the way such as uncooperative characters or false leads. End with a satisfying resolution.
It could be a Pokemon itself. Maybe a dark - type Pokemon with a grudge against humans and Pikachu in particular. This Pokemon could be using its powers to cause chaos in the city, and Pikachu has to figure out its motives and stop it before it's too late.
A more complex plot could involve Detective Pikachu trying to figure out a conspiracy among a group of humans who are trying to use Pokemon for illegal and unethical experiments. This would involve Pikachu teaming up with other Pokemon and human allies, like Tim, to expose the bad guys. They would have to face many obstacles and dangerous Pokemon controlled by the villains along the way.
One popular type of Pokemon Ash and Pikachu fanfiction might be adventure - based. For example, Ash and Pikachu could embark on a journey to a new and mysterious region filled with undiscovered Pokemon species. They might face challenges like difficult terrains and powerful, previously - unseen Pokemon. In this fanfiction, Pikachu's electric powers could be enhanced in some unique way, and Ash would have to strategize differently to overcome the obstacles.
One idea could be an OC who is a detective trainee and teams up with Detective Pikachu to solve a mystery in a new part of the Pokemon world. Maybe they are investigating a series of disappearances of rare Pokemon. Another plot could involve an OC with a special ability to communicate with certain types of Pokemon that Pikachu can't, and together they use their combined skills to stop a villain who wants to use these Pokemon for evil.
To create a unique Detective Pikachu OC, start with their appearance. Give them a distinct look, like unique hair or clothing style that sets them apart. For example, they could have a long purple coat with Pokemon - themed patches. Then, think about their backstory. Maybe they grew up in a family of Pokemon trainers but decided to become a detective instead. Their motivation could be to find a missing Pokemon that was once their family's pet.
The 'pokemon detective pikachu graphic novel' likely follows the adventures of Detective Pikachu as he solves mysteries in the Pokemon world. It might involve Pikachu using his detective skills, interacting with other Pokemon and humans, and uncovering secrets within the Pokemon universe.
A great idea for a Pokemon Detective Pikachu fanfic could be to set it in a different region. For example, a region that is mostly covered in ice. Pikachu and Tim would have to adapt to the new environment and the different types of Pokemon there. They could be investigating a series of disappearances of ice - type Pokemon. Maybe there's a secret underground lair where a powerful but misunderstood Pokemon is hiding and Pikachu has to use his detective skills to uncover the truth and save the day.
Detective Pikachu is surely one of the main characters. There might also be other Pokemon and human characters that play important roles, like Tim Goodman who is often associated with Pikachu in the Detective Pikachu storylines.