One popular idea is a Sherlock crossover with the Harry Potter universe. Imagine Sherlock using his deductive skills in Hogwarts to solve magical mysteries. Another is a crossover with the Marvel universe, where Sherlock might team up with Iron Man to outwit villains using their combined intelligence. A third could be a crossover with the Doctor Who series, with Sherlock and the Doctor traveling through time and space while solving complex cases.
One idea could be that Merlin uses his magic to help Sherlock solve a case that seems to have supernatural elements. For example, a series of murders where the victims all seem to have died from some unexplainable force. Merlin's ability to sense magic and his knowledge of the old ways could give Sherlock new perspectives on the case.
One idea could be to have Sherlock investigate a mystery related to a historical event in Hetalia. For example, he could look into the disappearance of a valuable artifact during a time of war in one of the Hetalia countries. Another idea is to have the Hetalia characters assist Sherlock in solving a case in London. Maybe Italy could provide some unexpected insights with his unique perspective. Also, a crossover could involve Sherlock being transported to the Hetalia world and having to adapt to its strange rules and cultures while still using his detective skills to solve local mysteries.
Another idea is that Sherlock and Tony Stark team up. They are both highly intelligent. Tony could provide Sherlock with high - tech gadgets to aid in his investigations, while Sherlock could help Tony with his personal problems. For example, Sherlock might figure out who is trying to steal Stark Industries' secrets by observing the small details in the company's operations.
Some Sherlock crossover fanfics that are well - liked include the ones that cross with the 'MCU' (Marvel Cinematic Universe). Imagine Sherlock Holmes trying to figure out the science behind the superpowers of the Avengers while also solving a mystery that ties into their world. Then there are crossovers with 'Sherlock Holmes in the 22nd Century'. It could be interesting to see how the classic Sherlock interacts with his futuristic counterpart in a fanfic.
One idea could be that Sherlock's deductive skills are needed to solve a mystery in the magical world of Doctor Strange. Maybe a powerful artifact has been stolen and Sherlock's unique way of seeing details helps find it. Another could be that Doctor Strange uses his magic to transport Sherlock to different dimensions to solve a case that spans across realities. For example, a serial killer who can move between dimensions and Sherlock has to use Strange's magic to track him down.
Some people like the idea of a Slenderman and Minecraft crossover in fanfiction. Picture Slenderman lurking in the blocky Minecraft landscapes, scaring the players. Another possible crossover is with the Gravity Falls universe. Dipper and Mabel could stumble upon Slenderman during one of their adventures in the strange town. And a crossover with the Resident Evil series would be intense. Slenderman in a world full of zombies and bio - horror threats would create a really complex and terrifying scenario for a fanfiction.
Well, a cool plot might be that Sherlock and Reid from Criminal Minds get into a battle of wits over a case. The case could involve a super - intelligent criminal who is playing mind games with both of them. Or perhaps there's a case where the BAU's profiling skills are needed to understand the motives of a criminal that Sherlock has been chasing, but can't quite figure out the 'why' behind the crimes. And they end up learning from each other's methods.
A cool crossover would be with the One Piece universe. Rin could be on a pirate ship, using his powers during sea battles and exploring the Grand Line. Another idea is a crossover with the My Hero Academia world. He could attend U.A. High and learn about different quirks while also showing off his own unique abilities. A crossover with the Inuyasha world would also be great. He and Inuyasha could team up to fight demons together.
Another popular crossover is with the Pokémon world. Samus exploring the Pokémon regions, perhaps using her skills to help or hinder trainers. She could encounter powerful Pokémon and have to use her own abilities to get out of tricky situations. It's an interesting contrast between her high - tech world and the more natural, creature - based world of Pokémon.
One popular idea is a crossover between 'Naruto' and 'One Piece'. Imagine Naruto characters on a pirate ship or Luffy trying to learn ninjutsu. Another is 'Sailor Moon' and 'Cardcaptor Sakura' crossover, where the magical girls team up to fight a common enemy. And a 'Dragon Ball' and 'Fullmetal Alchemist' crossover could be interesting, with the powerful Dragon Ball characters in the world of alchemy.