Well, you could write a kamen rider oc fanfiction where the OC is a foreign exchange student who discovers they have kamen rider powers. They have to learn about the local culture as well as how to use their new powers to fight the evil forces. Maybe they bring in some unique fighting styles from their home country. It would be interesting to explore how they interact with the existing kamen rider characters and how they adapt to this new world of kamen riders.
One idea could be creating an OC (Original Character) who is a time - traveling kamen rider. They could go back in time to prevent certain disasters in the kamen rider universe. Another idea is an OC that has a unique transformation device, like a kamen rider who transforms using music notes. For example, their henshin (transformation) sequence could be accompanied by a symphony.
One idea could be to cross over a Kamen Rider OC with a well - known anime character. For example, a Kamen Rider OC with Naruto. The OC could use their Kamen Rider powers in the Naruto universe, facing off against ninjas. Another idea is to have a crossover with a superhero from Western comics. The Kamen Rider OC might team up with Spider - Man to fight a common enemy in New York City.
One idea could be an OC who is a scientist from a different dimension and has a unique build system. For example, instead of using bottles, they use crystals with special powers. Another idea is an OC who is a street racer by day and a Kamen Rider by night, with their racing skills incorporated into their fighting style as Build. Or perhaps an OC who is a young prodigy in the field of robotics and creates their own Kamen Rider Build - inspired suit with advanced robotic functions.
A cool Kamen Rider Kiva OC fanfiction concept could be an OC from another dimension. This OC could bring with them different technologies or powers from their own world. Maybe they have a device that can disrupt the Fangire's ability to transform or a power that can heal the victims of Fangire attacks. Their presence in the Kiva world could also create a rift between the different factions, as some might see them as a threat while others see them as a potential ally.
One idea could be a crossover with other Kamen Rider series. For example, Ryuki characters interacting with those from Kamen Rider Decade. They could team up to fight a common enemy that has the ability to travel between different Rider worlds. Another idea is a crossover with a popular anime. Maybe Ryuki riders in the world of Naruto, where they have to adapt their fighting styles to the ninja world.
One idea could be a crossover with another Kamen Rider series like Kamen Rider Decade. Blade could find himself in Decade's world, where he has to team up with Decade to fight a common enemy that threatens both their worlds. This would bring a lot of action and an interesting dynamic between the two different Kamen Riders.
Another plot could involve Cronus teaming up with a former enemy to face a greater threat. This would force him to re - evaluate his relationships and motives. For example, he might have to work with a Kamen Rider he once tried to destroy. It could lead to some great character development for him.
One idea could be a crossover with another Kamen Rider series like Kamen Rider W. They could team up to fight a common enemy that is causing chaos in both of their worlds. Maybe the Dopants from Kamen Rider W are working with some of the Horoscopes from Kamen Rider Fourze.
A more complex idea could involve the Mirror World from Ryuki. In the fanfiction, the RWBY characters could be accidentally pulled into the Mirror World. There, they meet the Riders from Ryuki and have to figure out a way to escape. Along the way, they learn about the rules and dangers of the Mirror World, and also discover some secrets about their own powers.
One idea could be a crossover with other Kamen Rider series, like Kamen Rider Decade. The two riders could team up to fight a common enemy that has the ability to travel between different rider worlds. It would be exciting to see how their different fighting styles and powers combine.
One idea could be a crossover with another Kamen Rider series like Kamen Rider Kuuga. They could team up to fight a common enemy that is stronger than what they've faced individually. For example, a new type of unknown that has the powers of both Gurongi and the Lords. Another idea is a crossover with a superhero from the Marvel or DC universe. Imagine Agito and Spider - Man working together in New York City, with Agito's powers impressing Spider - Man and them learning from each other's combat styles.