[OathToOblivion]

Okay, this is how I view the Kamen Rider Multiverse:

- The Showa Riders are explicitly in the same universe.
- Kuuga and Agito are in the same universe, since the G-series was based on Kuuga, and built to fight the Grongi.
- Ryuki could be in any universe, because its ending retcons it out of existence
- Den-O and Kiva are in the same universe, as seen in Climax Deka.
- Decade is Decade, nuff said.
- The other Phase 1 Heisei Riders are in their own universes, minus Kabuto which appears to be the universe of The First and The Next.
- W-Wizard are in the same world, as seen many times, but I'll stick to the things seen in the actual shows. The King's Core Medals appeared in W 48, Kengo and Yuki appeared in OOO's finale, and Haruto appeared in Fourze's finale, unintentionally cockblocking Shun. In addition, since Kuuga, Ichigou, and Super-1 were seen in archive clips in the beginning of Fourze, that means that this World is the same one as the Showa Universe, and the Kuuga-Agito Universe
- Gaim is definitely in its own world, but the Sengoku Movie Battle might have still happened anyway since it was mainly in the Sengoku World. Nothing says Haruto came from the same world as Kouta.
- Drive...is tricky. Because Movie War Full Throttle is definitely canon to both series, but nobody mentions anything about the Helheim Invasion.