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 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.
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.
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.
One popular character is Poppy Pipopapo. She's often a central figure in many fanfictions due to her energetic and bubbly personality. Her unique powers and her role within the kamen rider world make her a great focus for various storylines.
Well, in many fanfictions, the female Kamen Rider who has a mysterious origin is quite popular. Maybe she's from a lost tribe of riders or has a connection to an ancient power. And characters who are her rivals turned allies are also interesting. They start off competing with her but then realize they have to work together. Also, female characters who are part of a Kamen Rider team and bring a different dynamic to the group are popular in fanfiction.
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.
Another popular character could be Blake Belladonna. Her stealthy nature and her ability to use her shadow clones could interact well with the kamen rider powers. In fanfiction, she might team up with a kamen rider to take on enemies that are difficult to defeat using her normal RWBY abilities alone. For example, a kamen rider's ability to detect hidden threats could complement Blake's stealth skills.
Often, Iron Man from the Avengers and Kamen Rider Decade are popular. Iron Man's high - tech gadgets and intelligence make for interesting interactions with the unique powers of Kamen Rider Decade. They can both be seen as leaders in their respective groups, so seeing them work together or clash in fanfiction can be really engaging.
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.