oktavia_von_seckendorff
Mahou Shoujo Madoka Magica character.
An armored mermaid ]] introduced in episode 9 and seen again in episode 10. Her minions are (the performer) and [[Klarissa_(Madoka_Magica)| (the backup dancer).
Note: Major spoiler warning!
She is the tragic result of Miki Sayaka becoming a Witch.
Also becomes a stand-like entity for Sayaka in the Rebellion movie.