Kamen Rider W could also be a great crossover character. W has a two - in - one nature with Philip and Shotaro. Their detective - like approach to fighting crime could contrast with Kickhopper's more direct combat style. They could work together to solve a mystery that is related to both their worlds, perhaps a criminal organization that is using technology from the Kamen Rider world and some other unknown power source.
Another possibility is Kamen Rider Decade. Decade has the ability to transform into different Kamen Riders, and his presence in a crossover with Kickhopper could bring a lot of different elements into the story. He could use his powers to help Kickhopper access new forms or abilities, or they could travel through different Kamen Rider worlds together to stop a multiverse - level threat.
Well, perhaps the fanfic could revolve around Kickhopper finding himself in an alternate universe where the rules of being a Kamen Rider are different. He has to adapt and form a crossover alliance with a local hero. They start by comparing their transformation devices and learn from each other's fighting styles to defeat a group of interdimensional thieves who are stealing important artifacts from both universes.
In terms of anime characters, Ichigo Kurosaki from 'Bleach' could be an interesting addition. His ability to see and fight spirits could be related to Kiva's battles with Fangires. They could end up in each other's worlds and have to learn to use their powers together to fight off both Hollows and Fangires.
In a crossover with Kamen Rider Decade, Decade could be a potential ally. Decade has the ability to travel through different Kamen Rider worlds and could help Cronus if they find themselves in a complex multi - world situation. Also, Kamen Rider Kuuga might be an ally. Kuuga has a strong sense of justice and his raw power could complement Cronus' more calculated fighting style.
One unique feature is the combination of different Kamen Rider characters. It allows fans to see their favorite Riders interact in new and unexpected ways. For example, a veteran Rider might team up with a newbie Rider.
Iron Man would also be an interesting crossover character. With his high - tech suit, he could team up with Kamen Rider Mach. They could share technology and upgrade each other's gear. Imagine them combining their firepower to take on a huge mecha - like enemy. Iron Man could provide aerial support while Mach attacks from the ground.
Kamen Rider Decade would be an excellent choice. Since Decade can travel between different Kamen Rider worlds, it would be easy to create a story where he and Orga meet and team up. Another good option is Kamen Rider Kuuga. Their different fighting styles and powers could create an interesting dynamic. Also, Ultraman could be a great crossover character. The contrast between the Kamen Rider and Ultraman universes would make for a very exciting story.
Definitely other Kamen Riders like Kamen Rider Kabuto. Their different powers and personalities would make for an exciting crossover. They could team up with Faiz to fight a common enemy or have a friendly rivalry.
For a 'Kamen Rider crossover feudal Japan' fanfic, a Kamen Rider would be a must - have main character. In addition, a ronin, a masterless samurai, could be another main character. This ronin could have his own code of honor and be very skilled in combat. He and the Kamen Rider might meet in a dangerous situation, like being chased by bandits. And there could also be a young princess who is caught in the middle of a political intrigue in the feudal court. The Rider and the ronin might end up protecting her and in the process, get involved in the larger events of feudal Japan.
One common theme is the exploration of different power combinations. When Kamen Rider W crosses over with another character, fans like to see how their powers interact. Another theme is the clash of personalities. Different riders or characters have distinct personalities, and seeing how they get along or butt heads in a crossover can be really engaging.
In a Kamen Rider crossover, you can develop their personalities through their interactions with other Riders. If a more serious and stoic Rider meets a very energetic and talkative one, there will be a clash at first. But as they go through challenges together, they start to understand and even adopt some of each other's traits. For example, the serious Rider might become a bit more relaxed and the energetic one might learn to be more focused. Also, new relationships can be formed, like friendships or rivalries, which can shape their personalities in different ways.