The sidekick characters are often quite popular too. They add humor and support to the detective's adventures, like the little mouse who is always getting into comical situations but also provides useful information at times.
Obviously, the great mouse detective himself is very popular. His intelligence and charm draw readers in.
Definitely Sherlock Holmes. Since The Great Mouse Detective is inspired by Sherlock Holmes, a crossover with the original Holmes would be very interesting. They could compare and contrast their detective methods.
Goofy is also quite popular. His clumsy yet loveable personality can bring a lot of humor to crossovers. Whether he's getting into trouble with new characters or teaching them his unique ways, he's always fun to include.
You could introduce a brilliant mouse scientist who has created some newfangled gadget that could help Basil in his detective work. Another good character could be a mysterious mouse from a far - off land who has some valuable information about the case but is very secretive. And a street - wise mouse informant who knows all the gossip and rumors in the city would also be great.
Ryuu is often a popular character in Detective Academy Q fanfiction. His cool and collected nature, along with his sharp detective skills, make him a favorite to write about. Writers often put him in the lead role for solving complex cases.
One way is to give the human a unique backstory. For example, if it's a detective in the Great Mouse Detective world, he could have a past that led him to be interested in solving cases in both the human and mouse worlds. Maybe he grew up near a place where the mice and humans interacted a lot, so he has a natural curiosity.
A human can be a helper. They could assist the mouse detectives by providing resources that are difficult for mice to obtain, such as certain tools or information from the human world.
One interesting story could be about the great mouse detective solving a mystery in an old, abandoned cheese factory. The clues are hidden among the cheese wheels and old machinery.
Probably courage and problem - solving. The mouse detective must be brave to face the challenges and mysteries in the story. And he has to use his intelligence to solve the problems he encounters. Also, there could be a theme of community, where different mouse characters work together towards a common goal.
Harry Potter himself is often a popular choice as he is the central character in his own series. His magical abilities and his quest to defeat Voldemort can add an interesting dynamic to crossovers. Another popular character is Conan. His intelligence and detective skills are highly valued in these fanfictions. Hermione is also popular as she can bring her vast knowledge of magic and her logical thinking to the mix, which pairs well with Conan's detective work.
Some of the villainous Pokémon can also be popular in Detective Pikachu fanfiction. For example, a powerful and devious Pokémon that Detective Pikachu has to outwit. These characters add conflict and excitement to the stories, and their motives and actions can be delved into deeply in fanfiction.