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.
Well, you could have an OC that was once a test subject in the same experiments that led to the creation of Build. This OC could have developed some unexpected abilities due to the experiments. They might struggle with controlling these powers at first but then learn to use them for good. Another interesting concept is an OC who is a detective. They use their detective skills to solve the mysteries behind the monsters that Build has to fight. And also, an OC that is an alien with a completely different form of transformation related to Build's concept could be really cool.
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.
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 that the Avengers are transported to the world of Kamen Rider Build. They team up with Build to fight a common enemy that has the power to disrupt both universes. For example, a villain who can manipulate matter like Build's powers but on a much larger scale, threatening Earth in the Avengers' world and Build's city in his world.
One idea could be that Sento and Banjou have to face a new threat that targets their friendship. Maybe an enemy uses mind - control to make them turn against each other, and they have to break free from it to save the city. Another could be a time - travel plot where they go back in time and meet their earlier selves, which causes all sorts of chaos in the timeline.
One great 'Kamen Rider Build' fanfiction story could be about an alternate universe where Build teams up with other Kamen Riders from different series to fight a common super - powerful enemy. This kind of crossover fanfic can be really exciting as it combines different powers and personalities.
One key element is a well - developed OC. This includes their appearance, like what kind of suit or costume they have if they are a rider - type character. Their personality is also crucial, whether they are brave, cunning, or kind - hearted. Another element is the plot. It should have a clear beginning, middle, and end. For example, the OC could start as an unknown figure and gradually become a key player in the fight against the evil in the Build 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.