Kenzo Hakkoda[]
- Japanese Name: 八甲田 健三, Hakkōda Kenzō
- Voice Actor: Atsushi Miyauchi
Owner of the live cafe Submariner that Argonavis frequents. He was originally a drummer in the band that gave the name of the live cafe.
Shintaro Mashu[]
- Japanese Name: 摩周 慎太郎, Mashū Shintaro
- Voice Actor: Takuya Satō
GYROAXIA's manager. He had watched an Argonavis performance and suggested that they will be the opening act in GYROAXIA's Hokkaido tour.
Gilbert Mont d'or[]
- Japanese Name: ジルベール・モンドール
- Voice Actor: Tadokoro Hinata
Brother of Fantome Iris vocalist, FELIX.
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