Platonic was a thief from Calgaround in the Kingdom of Elphegort. After her mentor's death, she was hired by AB-CIR to steal the red wine glass of Banica Conchita and later the Twin Blades of Levianta from Elluka Clockworker. As punishment for the attempted theft, Elluka forced Platonic to be her servant over the course of a year. During that time, Elluka tried to teach Platonic to cast spells, only to learn that she had no magical talent. Utterly miserable, Platonic attempted to escape multiple times.