Also part of the film's cast are:
- Naniwa Danshi's Kento Nagao (Homestay) as a younger Rohan
- Fumino Kimura (The Fable) as Nanase, a mysterious black-haired girl that Rohan encountered when he was younger
- Masanobu Ando (Battle Royale) as Ryunosuke Tatsumi, an art appraiser examining a collection at the Lourve
- Minami (Tomie: Revenge) as Ema Noguchi, a guide who works at the museum and welcomes Rohan
The staff from the previous three seasons will once again work on the film with Yasuko Kobayashi (Kamen Rider Den-O, Samurai Sentai Shinkenger) writing the series' script, and Naruyoshi Kikuchi (Tokyo Ghoul: 'S') composing the film's music. Lastly, Kazutaka Watanabe (Only Yesterday live-action special) returns to direct the film. Rohan au Louvre is set to premiere this May 26th.