The Multiverse, a term given to the group of parallel worlds, dimensions, realities, realms, or universes. And, in one of these dimensions, known as Dimension-1218 (also known as the “Real World”), this “Multiverse Theory” has never been actually proven true. That is, until an autistic 19 year old boy named Nick Brown, who just graduated from high school a year late due to the Covid-19 Pandemic, discovers a mysterious, yet familiar-looking, pocketwatch. Now, Nick must use his newfound powers to fight enemies from other dimensions, while also traveling to these alternate worlds, as the new Defender of Worlds, and successor of the Destroyer of Worlds. And, maybe, also find a world where he’ll find a sense of belonging. He’s just a passing through Kamen Rider, remember that!

Disclaimer: I do not own Kamen Rider Decade, nor any other Kamen Riders. I also don’t own any other characters and/or series that will/may appear in this story. Also, I will be censoring any inappropriate language and context in this story.

I'm going to show some other important characters who will be in the story and turn into Kamen Riders.


Home World/Reality: Earth (World of Kuuga).


Backstory: A young man with a child-like personality at first who has the power to become Kamen Rider Kuuga. Although originally from the World of Kuuga, he eventually joins up with the Hikari Studio group having rid his home world of the Gurongi, and began traveling the multiverse alongside Tsukasa Kadoya, the original Decade.


Home World/Reality: Earth (World of Natsumi).


Backstory: A young woman who works at the photo studio under her grandfather, having lived with him since her childhood. She traveled the multiverse alongside Tsukasa Kadoya, the original Decade.


Home World/Reality: Earth (World of Diend).


Backstory: A phantom thief and treasure hunter from the World of Diend. Daiki knew, and fought both with, and against, Tsukasa Kadoya, the original Kamen Rider Decade. He first meets the Brown siblings in the World of Legend, to test if Nick is good enough to be Tsukasa's successor as Decade. He then gives Nick his old Diendriver, allowing him to summon clones of other Kamen Riders.


Home World/Reality: Earth (World of Legend).


Backstory: A resident of the World of Legend who was saved by the original Kamen Rider Decade, Tsukasa Kadoya. Kaguya becomes a golden version of Decade to protect his home world from the Hundred. Nick first meets him when he brings him to his world to test Nick's "Gorgeousness", and see if he is worthy of being the new Decade.


Other Rider Bios