Youma's are referred to as demons, monsters and mutants, they are used exclusively by the Dark Kingdom. Evil beings that are not supposed to exist in this world. They are sent by members of the Dark Kingdom to gather energy, find the Silver Crystal and destroy the Sailor Senshi. Jadeite makes them from clay, Nephrite uses a Soul Shadow.
- Morga in Act 1. Usagi, Sailor Moon
- Female Instructor in Act 2. Ami, Sailor Mercury
- Bride in Act 5. Makoto, Sailor Jupiter