The OC might also be a new ally to Conan and his friends. They could bring in new skills or knowledge that helps in taking on more difficult cases. For example, if the OC has knowledge of international criminal networks, they could assist in cases that have a global scope.
First, you need to develop your OC. Decide on their appearance, personality, and skills. For example, if your OC is a detective, what makes them different from Conan? Then, think about the plot. It could be a new case that Conan and your OC work on together. Maybe start with a simple mystery, like a stolen item from a local store. Next, write an engaging opening. You can start with a description of the crime scene or an introduction to your OC. For instance, 'The sun was setting as [OC's name] walked down the busy street in Beika, not knowing that she was about to stumble upon a mystery that would change her life.'
You can make it unique by giving your OC a really distinct personality. For example, if your OC is super shy but has a hidden talent for solving puzzles. Also, create a special backstory for the OC that ties into the Detective Conan universe in an unexpected way, like having an OC whose family has a long - lost connection to one of the main characters' families. And don't be afraid to introduce new types of cases that haven't been explored much in the original series.
Another one is 'The Italian Connection'. In this fanfiction, the Italian OC has ties to the criminal underworld in Italy. This connection creates a lot of suspense and mystery. The OC could be on a mission to clear their family name from false accusations, and Conan teams up with them to uncover the truth.
There is a fanfiction where the Akai OC is a genius hacker. This OC uses their hacking skills to gather information for the cases in Detective Conan. They can break into secure systems to find clues that are crucial for solving the mysteries. The story also explores how this OC's genius is not only about intelligence but also about emotional intelligence. They are able to understand the motives of the criminals on a deeper level, which gives them an edge in solving the cases. It's an interesting take on the typical Detective Conan fanfiction with an Akai OC.
One common theme is the clash of cultures. Since the OC is Italian, there's often a contrast between Italian culture and the Japanese setting of Detective Conan. For example, different approaches to solving problems or different social norms.
One idea could be creating an OC who is a master of disguise, like Conan, but with a unique backstory. Maybe they are from a different country and have their own reasons for getting involved in the detective work in Japan. Another idea is an OC that has a special gadget - something that hasn't been seen in the original series yet, like a device that can analyze poisons instantly. And a third idea could be an OC who is a childhood friend of Shinichi's that has some hidden talents related to solving mysteries that come to light after his transformation into Conan.
An OC can fit in as a new ally or enemy. For example, if the OC is a vampire hunter, they would be an enemy to the Originals. But if they are a witch offering help against a common threat, they could be an ally.
One great Akai OC prodigy fanfiction is 'The Hidden Talent'. It has a really interesting plot where the OC, a young prodigy, teams up with Akai to solve a complex case in the Detective Conan universe. The character development is well - done, and it keeps you on the edge of your seat.
Well, you could have an OC that is a childhood friend of Shinichi who has a photographic memory. This OC could recall small details from their past that end up being crucial in solving current cases. Or perhaps an OC who is an expert in a very specific field, like ancient languages, and Conan has to rely on this OC's knowledge when a case involves old inscriptions or manuscripts. Also, an OC who has a connection to the Black Organization, either as a former member trying to reform or someone unknowingly involved in their plans, could add a lot of drama to the fanfiction.
He could be a new student at Sofia's school for royalty. He might come from a different culture and bring new ideas and ways of doing things. For example, he could introduce a new style of dancing or a different form of magic study. This would create interesting interactions with Sofia and the other characters as they learn from him and he learns from them.