One challenge is combining the two very different universes. Naruto's world is full of ninjas, chakra, and a feudal - like society. Kamen Rider Decade's world has high - tech elements and the concept of Riders. Merging these two concepts without making it seem forced can be difficult. Another challenge is staying true to the characters. Naruto is known for his determination and his goal to become Hokage, while Decade has his own mission to travel through different Rider worlds. Keeping their personalities intact while putting them in new situations is not easy.
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.
Natsumi Hikari is a popular character in Kamen Rider Decade fanfiction. She provides a sort of 'normal' perspective in the otherwise extraordinary world of Riders. Writers might explore her growth from being a somewhat reluctant companion to Decade to becoming a more confident and important part of his adventures. Her relationships with other characters, especially Decade, are often a focus in fanfiction.
Tsukasa Kadoya, who is Kamen Rider Decade, is a key character. Then there are the other Kamen Riders from different worlds that he encounters. For example, Kamen Rider Kuuga. Their interactions with Decade shape the story. Also, Natsumi Hikari plays an important role as she is often involved in Decade's adventures and provides a different perspective compared to the more combat - oriented Decade.
One of the main storylines often involves the journey of the Kamen Rider Decade through different Rider worlds. He has to face various challenges and foes specific to each world he visits.
In the last episode of Masked Rider Wizard, the Masked Rider included:
1 Kamen Rider Ape: The Kamen Rider Ape is the first Kamen Rider in the Wizard series to appear in the first episode.
Kamen Rider Ringwraith: The Kamen Rider Ringwraith is the second Kamen Rider in the Wizard series to appear in the second episode.
3. Masked Rider Form Zero: Masked Rider Form Zero is the third Masked Rider in the Wizard series to appear in the fourth episode.
4. Kamen Rider Dragon Rider: The Kamen Rider Dragon Rider is the fourth Kamen Rider in the Wizard series to appear in the sixth episode.
5 Kamen Rider Lightning King: The Kamen Rider Lightning King is the fifth Kamen Rider in the Wizard series to appear in the seventh episode.
The appearance of these masked knights in the last episode of the Wizard series drew a perfect ending to the entire series.
Another antagonist could be a group of Kamen Riders from different timelines who see Dark Decade as a threat to the stability of the multiverse. They might band together to stop him, even if he has good intentions in the fanfiction's plot.
There was an episode of the Kamen Rider Ex-aid where the other Kamen Rider appeared. This episode was called " Kamen Rider Ex-aid: Dragon Rider and Heavenly Will's Determination."
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.
In a Kamen Rider Decade Crossover Fanfiction, Decade could end up in a world where the Kamen Riders are all children. He has to protect them from an evil force that wants to use their power before they fully understand it. This would involve him teaching them how to use their Rider powers in a more creative and simple way. He could also cross over with a classic monster movie world, like Godzilla's world. Decade and the Kamen Riders have to work together with the monsters to stop an even greater threat.