Another possibility is a crossover with Iron Man. The high - tech gadgetry of Iron Man could be compared and combined with the Green Hornet's own tech. They could collaborate to stop a tech - savvy villain who is stealing advanced technology from both of their arsenals. This would bring together two very different yet tech - oriented heroes.
One idea could be a crossover with Spider - Man in an alternate universe where the Green Goblin teams up with Doctor Octopus against a more powerful and darker version of Spider - Man. They could form an uneasy alliance to take over the city's criminal underworld.
One idea could be that the Green Lantern Corps discovers a threat that has its origin in the Marvel Universe, like a powerful artifact from Asgard that is being misused. The Green Lanterns then have to team up with the Avengers to retrieve and safeguard it. Another plot could involve a character like Hal Jordan being accidentally transported to the Marvel Universe and having to work with Spider - Man to find his way back home while also facing a common enemy.
The Green Arrow would be a great addition. He has a similar vigilante style to the Green Hornet. They could compare their archery skills (if the Green Hornet were to pick up a bow in the fanfiction) and their approaches to fighting crime in their respective cities. It would also be interesting to see how their sidekicks, Kato and Speedy, interact.
There could be. Many fans are creative and love to write crossovers. However, it might not be easy to find. You may need to dig deep into different fanfic communities and search engines dedicated to fan works. Sometimes, even if it exists, it might not be very well - known or highly ranked, so you have to be patient during the search.
Maybe a crossover with a magical anime. The nanbaka characters could suddenly find themselves in a world full of magic. Some of the nanbaka characters might be really good at using magic in unexpected ways, like Jyugo using his shackles in a magical battle.
A crossover with a modern - day action story could be really cool too. Spartacus and his crew could be brought to the present day through some time - travel mishap. They then have to navigate the modern world, learning about new weapons and technology. They could use their ancient fighting techniques in modern combat situations, like taking on a powerful criminal organization.
Maybe in the fanfiction, the three - tailed beast crosses over into a modern - day human world. People initially fear it, but then they discover that it has a gentle side and is actually trying to find its way back home. It could form a bond with a group of humans who help it on its journey, leading to many adventures along the way.
One idea could be a crossover with 'Fullmetal Alchemist'. Dorohedoro's dark and gritty world combined with the alchemical concepts would be fascinating. For example, the characters from Dorohedoro could be exposed to the laws of equivalent exchange. Another plot could involve a crossover with 'Hunter x Hunter'. The nen abilities in 'Hunter x Hunter' could interact in strange ways with the magic in Dorohedoro's world. Maybe a character from Dorohedoro has to participate in the Hunter Exam. A third idea is a crossover with 'Tokyo Ghoul'. The idea of the ghouls' existence in Dorohedoro's setting and how they would coexist or clash with the existing creatures and characters there.
One idea could be a Vegito crossover with the Dragon Ball GT universe. Vegito could face off against the Shadow Dragons, creating an epic battle of power. Another could be a crossover with the One Piece world, where Vegito has to navigate the Grand Line and deal with pirates. Maybe he teams up with the Straw Hats to take on a common enemy.
One idea could be a crossover with the 'Indiana Jones' series. The Mummy's curse could somehow be related to an ancient artifact that Indiana Jones is after. Maybe they have to team up to stop the mummy from unleashing a greater evil.