Initially introduced as the general manager of OSTO Legacy, asking for the club's assistance. Later reveals himself as Groundain, an android who betrayed his creator and joins Skydain in attempting to destroy Earth before being defeated.
Symbiotic Kyodain pair who operate as a unified threat.
Allied antagonists who coordinate their attacks after revealing their true identities.
Professional contact who outlines the mission parameters to the club.
Professional contact who initially hires the club for a corporate mission.