Mistress 9 is the "Messiah of Silence" from Tau Nebula.
In the older Sera Myu Musicals, Mistress 9 had jet black hair and wore a shiny, blue maxi dress with black mesh sleeves. In the newer musicals, her outfit looked exactly like the manga but it has black sleeves.
Mugen Academy - Mistress Labyrinth
- Both actresses to portray Mistress 9 were "promoted" to Sailor Guardian roles after one full run as Mistress 9.
- Tomoko Inami went on to play Sailor Neptune starting with 2003's Mugen Academy ~ Mistress Labyrinth - Revised Edition -, following Asami Yuuka's departure from the role. Tomoko remained in the role of Sailor Neptune through 2003's Starlights * Ryuusei Densetsu and the Second Stage Final Kakyuu-ouhi Kourin in 2004.
- Chinatsu Akiyama went on to play Sailor Star Fighter in both Starlights * Ryuusei Densetsu in 2003 and Kakyuu-ouhi Kourin in 2004.