What are some interesting plot ideas for Kamen Rider Decade Crossover Fanfiction?

One idea could be exploring the backstory of Dark Decade more in - depth. Maybe there was a tragic event in his past that led him to his current path. Another could be a crossover with other Kamen Rider series, where he teams up with a Rider from a different timeline.

One interesting Kamen Rider Decade fanfiction could be about Decade traveling to different Rider worlds and teaming up with alternate versions of himself. For example, he might meet a younger version of himself in the Kuuga world and they have to work together to defeat a new, powerful enemy that is threatening all Rider worlds.

A crossover with Kamen Rider Zi - O could also be really cool. Zi - O travels through time, so he could accidentally disrupt the timeline in a way that affects Ghost's world. Ghost might have to team up with Zi - O to fix the timeline while also dealing with the enemies that are taking advantage of the time - chaos. They could encounter different versions of themselves from alternate timelines and have to figure out how to make things right.

One interesting plot idea could be Chalice crossing over with another Kamen Rider series, like Kamen Rider Decade. They could team up to fight a common enemy that has the ability to travel across different Rider worlds. Maybe this enemy is stealing the powers of various Riders, and Chalice and Decade have to figure out how to stop it while also learning about each other's abilities and fighting styles.

A really cool plot could involve Kamen Rider Mach crossing over with a time - traveling hero. They have to go back in time to stop an evil organization from changing history in a way that would be disastrous for the future. There could be lots of cool chase scenes and battles in different historical eras.

One idea could be a crossover with another Kamen Rider series like Kamen Rider W. The two Riders could team up to fight a new, powerful villain that is causing chaos across both of their worlds. They would combine their unique abilities and gadgets to take on the enemy.

One interesting plot idea could be a crossover with another Kamen Rider series where Cronus has to team up with a Rider from a different timeline. They could face a common enemy that threatens both their timelines. For example, a powerful time - traveling villain who wants to rewrite history to make himself the supreme ruler of all timelines. This would force Cronus to set aside his usual self - centered ways and work with the other Rider.

A really cool plot could be a time - travel crossover within the Kamen Rider Ex - Aid universe itself. The Riders could travel back in time to the early days of the Bugster virus outbreak. They would have the knowledge of how things turned out in the future, but would face challenges because changing the past could have unforeseen consequences. This would lead to a lot of moral dilemmas for the characters as they try to stop the virus in a different way without making things worse.

Another plot idea is a time - travel crossover. Zero One could be sent back in time to the era of the first Kamen Riders. There, he has to adapt to the different fighting styles and technology of that time. He might also introduce some of his own futuristic technology to the early Kamen Riders, changing the course of their battles and the development of their powers.

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.