Dr. Ratio has an eccentric temperament but an elegant demeanour. Dr. Ratio is sharp-tongued, intelligent, and arrogant. Dr. Ratio is a candid and self-centred Intelligentsia Guild member who often conceals his appearance with a strange plaster sculpture. Dr. Ratio has demonstrated unparalleled intelligence and talent since his youth, but now he refers to himself as a "Mundanite". Dr. Ratio has indigo hair and golden eyes.