Noah Kaminari/Kamen Rider Woz/Kamen Rider Agito (RBA-fireshot)

Jake Arc/Kamen Rider Zi-O

Hugh Rose/Kamen Rider Geiz

Sarah Nikos/Kamen Rider Tsukuyomi

Shinji Todoroki/Kamen Rider G3

Reiji Midoriya/Kamen Rider Gills

Bartholomew Gremory/Kamen Rider Faiz

Andrew Phenex/MegaRed

Iris Hyoudou/MegaPink (Bartholomew's love Interest)

Wallace Sitri/MegaBlue

Ramon Victor/MegaBlack

Caitlin Schnee/MegaYellow

Harrison Ryuzaki/MegaSilver

Nick Nicholson/Kamen Rider Fourze

Nathaniel Loud/Kamen Rider Gaim

S

unset Shimmer (Nick's yandere girlfriend)

Ryuga Katsuragi/Kamen Rider Kuuga/Kamen Rider OOO (geminithekiller)

Itsuka Kendo/Kamen Rider Build/Kamen Rider Cross-Z (Ryuga's yandere girlfriend)

Note: They're from another Omniverse, where they defend their world from various threats in secret.