|Occupation:||Daimon under the supervision of Kaolinite|
|First Anime Appearance:||Usagi's Idol! The Graceful Genius Michiru|
|First Manga Appearance:||N/A|
|First PGSM Appearance:||N/A|
|Actors:||Misa Fukai, Elizabeth Beeler (dub)|
Octave attacked by "playing" the violin which was the base of her body while vocalizing at high frequencies. She could both generate ultrasonic pulses to stun her targets and shoot a laser of destructive energy in this fashion. Her speed, reflexes, and dirty attack methods made her a difficult adversary for the Inner Senshi. After she had been weakened by a surprise attack from Sailor Uranus and Sailor Neptune, Octave was destroyed by Sailor Moon.
- Her name is also a technical term in music.
- Octave was one of the three Daimons who could use her singing voice as a weapon. The other two Daimons were Chikuon and U-Tahime.