Style Guide/A.R. Worlds

As referenced in Kamen Rider Decade as well as featuring in other media, there are several worlds. The central world as currently occurring in Toei media has all Kamen Riders, and, as well as some classic heroes operating in the same universe. The other worlds have versions of reality altered. It is openly stated that Tsukasa Kadoya, Decade, has a world all his own.

Main Universe

 * All Kamen Rider series and crossover series
 * World of Den-O - the events that occur here tie directly to Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship which ties into Kamen Rider Den-O and the overall crossover universe.
 * World of Shinkenger - the events that occur here tie directly to, which in turn ties into the overall crossover universe. Note that Riders are not openly known at this point, hence "a world with no riders". By Kamen Rider Fourze, Riders are an urban legend.

Nine Worlds

 * World of Kuuga (native world of Yuusuke Onodera)
 * World of Kiva (native world of King Wataru and Kiva-la)
 * World of Ryuki (native world of Shinji Tatsumi)
 * World of Blade (native world of Kazuma Kendate)
 * World of Faiz (native world of Takumi Ogami)
 * World of Agito (native world of Shouichi Ashikawa)
 * World of Kabuto (native world of Souji)
 * World of Hibiki (native world of Master Asumu)

New Worlds

 * World of Negatives (native world of the Dark Riders)
 * World of Diend (native world of Daiki Kaito)
 * World of Black RX (native world of an alternate (RX) Kotaro Minami)
 * World of Black (native world of an alternate (Black) Kotaro Minami)
 * World of Amazon (native world of an alternate Daisuke Yamamoto)
 * World of X-Rider (origin of Dai-Shocker's Apollo Geist)
 * World of Kamen Rider (origin of most leaders of Dai-Shocker)
 * World of Stronger (S.I.C. Hero Saga Kamen Rider Decade: World of Stronger)
 * World of the Rider War (the point of connection where the A.R. Worlds would merge)

Other

 * World of Decade (native world of Tsukasa Kadoya, despite to have 'no story of his own')