Hailing from 30th century Crystal Tokyo, they are all recruited by Shaman Apsu and given powers equal to their counterparts. Each girl has their own motives for joining, as does Apsu who is rapidly dying from existing in the Crystal Tokyo era. Each has their own attacks, or are capable of using an attack from a different villain.
- Sin - opposed to Sailor Moon
- Nabu - opposed to Sailor Mercury
- Nergal - opposed to Sailor Mars
- Marduk - opposed to Sailor Jupiter
- Ishtar - opposed to Sailor Venus
- The term "Oppositio" is a Latin term meaning opposition or oppose.
- Each of the Oppositio Senshi is named after a god worshiped by one or more cultures of ancient Mesopotamia (located in modern-day Iraq and Turkey):