The Gig Fighters are the mechanical footsoldiers of Warp Monarch and antagonists in Chouseishin Gransazer. They are spawned from devices carried by Warp Monarch's higher-ranking members and typically perform duties such as guarding prisoners or holding off the Gransazers.
Several Gig Fighters were brought along by Radia and Lucia to assist them in their mission to destroy the Earth. They were first used to attack a JSDF base to draw out the Gransazers so Radia could observe their power.
The Gig Fighters would go on to be used by several other Warp Monarch officials such as Sturcus and Gorfinian. They also appear in the crossover movie with Chousei Kantai Sazer-X where they are used as minions by the Space Pirate Fleet Descal.