Well, other Kamen Riders are very likely. For instance, Kamen Rider Chalice, as he has a connection with Blade in the original series. Their interactions in a crossover could explore more of their relationship and how they work together against new threats.
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.
Kamen Rider Decade is often a popular choice. His ability to transform into other Riders makes him a natural for crossovers. He can bring in elements from different series and connect various storylines together.
Well, from the Kamen Rider universe itself, characters from Kamen Rider Blade could be great for a crossover. Their different powers and personalities would create interesting interactions with the Ryuki characters. Another suitable character could be Kiva. His vampire - like nature and unique fighting style would add a new flavor to the Ryuki crossover.
Characters from Kamen Rider Decade are also frequently included. Decade has the ability to travel between different Kamen Rider worlds, so it makes sense for him to be in a 555 crossover. His presence can introduce new story elements and bring different Kamen Rider series together in a single fanfiction.
Well, Sonic the Hedgehog could be an unexpected character. Imagine Decade and Sonic teaming up to outrun an enemy that can move at super - speed too. Another one could be Pikachu. Decade might have to deal with Pikachu's electric attacks while they fight a villain together. And how about Harry Potter? Decade could end up in the wizarding world and team up with Harry to defeat a dark wizard who has somehow got hold of Kamen Rider technology.
Definitely Kamen Rider Decade is a very popular character to include. His ability to transform into various Kamen Riders gives endless possibilities for crossovers. And then there's Kamen Rider Zi - O, as the time - traveling Rider, he can bring a whole new dimension to the kamen rider w crossover fanfiction. Additionally, Akiko Narumi from the Kamen Rider W series herself is often included, as she can add a touch of normal - human - in - a - Rider - world perspective to the story.
Ruby Rose is often a popular choice. Her energetic and determined personality makes her a great candidate to interact with the Kamen Rider characters. She could be curious about their transformation abilities and might try to incorporate some of their techniques into her own combat style.
Tsukuyomi is also quite popular. She has her own set of abilities and a connection to Zi - O. In crossovers, she can interact with other female characters from different Kamen Rider series in unique ways. Also, Kamen Rider Decade is often included. Since he has the ability to travel through different Rider worlds, he can bring a lot of chaos and new story opportunities to a Zi - O crossover fanfiction.
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.