Sanratan, localized as Greta in some regions, operates as a transporter piloting the Catalga Zoid. She first appears in episode 10, providing food aid to Arashi and Analog. Her personality balances a self-proclaimed ladylike image with a tendency for sudden snaps, especially concerning finances or unexpected disruptions; this financial drive often leads others to repay debts by assisting her deliveries.

Though her occupation typically avoids combat, she possesses an exceptionally strong bond with her Catalga Zoid. This deep connection enabled her to utilize the Wild Blast ability even before the series begins, showcasing advanced synchronization. Her combat capability surfaces later in episode 27, where she effectively deploys Wild Blast during a confrontation.

Her noted interactions include Analog, who develops a crush on her during their initial encounter. True to the series' theme, her Japanese name translates to "hot and sour soup." Her documented role involves transport logistics and providing episodic assistance to the main group, such as rescuing them from a desert collapse and accepting their help with deliveries as repayment.