The trademark for the series was filed by Toei Company on September 8, 2020. According to producer Shinichiro Shirakura, the show's diversity in its titular members, featuring a human and four Kikainoids, is due to the Super Sentai series' recurring themes of diversity in its group of protagonists while maintaining strong characters. The reason why Zenkaizer was chosen as the leader despite being colored white is to ensure that he would stand out in future crossovers when grouped alongside other red warriors. The four Kikainoids' warrior forms were based on the mecha of previous
Super Sentai series. Zenkai Zyuran was based on
Kyōryū Sentai Zyuranger mecha Daizyujin, Zenkai Gaon was based on
Hyakujuu Sentai Gaoranger mecha Gao King, Zenkai Magine was based on
Mahō Sentai Magiranger mecha Magi King, and Zenkai Vroom was based on
GoGo Sentai Boukenger mecha DaiBouken. Although
Zenkaiger is open to the idea of featuring past heroes in certain episodes, Shirakura mentioned that it will not be done in a similar way to
Kaizoku Sentai Gokaiger. As members of the Zenkaigers combine to form the series' mecha, ZenkaiOh, the original plan was for their combined forms to appear human-sized at first, but as the show needed to keep up with the toy releases, this idea was scrapped and eventually implemented in the sequel series
Avataro Sentai Donbrothers through the titular group's mecha, Don Onitaijin. After series voice actor
Tatsuhisa Suzuki chose to go on hiatus, his role as Gege was rendered voiceless between episodes 21 and 25. Toei later announced
Masaya Fukunishi will take over the role of Gege from episode 25 onward.
Reception Kikai Sentai Zenkaiger is ranked 19th place in the 2021's "100 Internet
Buzzwords" in Japan, held by
Nico Nico Pedia and
Pixiv Encyclopedia. The physical award is given to Toei's producers of the series, Shinichiro Shirakura, Naomi Takebe, Kōichi Yada and Akihiro Fukada during the award ceremony on December 15, 2021. ==Films & Specials==