- Kamen Rider Geats side - Hideyoshi Kan (Ace Ukiyo/Kamen Rider Geats), Ryuga Sato (Keiwa Sakurai/Kamen Rider Tycoon), Yuna Hoshino (Neon Kurama/Kamen Rider Na-Go), Kazuto Mokudai (Michinaga Azuma/Kamen Rider Buffa), Kokoro Aoshima (Tsurumi), and Shugo Oshinari (Girori).
- Kamen Rider Revice side - Kentaro Maeda (Ikki Igarashi/Kamen Rider Revi), Subaru Kimura (Vice/Kamen Rider Vice), Wataru Hyuga (Daiji Igarashi/Kamen Rider Live), Ayaka Imoto (Sakura Igarashi/Kamen Rider Jeanne), Noritaka Hamao (George Karizaki), Yui Asakura (Hana Natsuki), Claud Hachijoin (Go Tamaki), Junya Komatsu (Hiromi Kadota), Miku Ito (Lovekov), Kurara Emi (Yukimi Igarashi), and Shigeyuki Totsugi (Genta Igarashi).
Lastly, Koda Kumi will perform the film's theme song. Directed by Takayuki Shibasaki (Kamen Rider: Beyond Generations), and written by Yuya Takashi (Kamen Rider Geats) & Hanta Kinoshita (Kamen Rider Revice), Kamen Rider Geats x Kamen Rider Revice MOVIE Battle Royale is set for a December 23rd release.
[Additional details from Natalie]