Ekaterina Roskova

Ekaterina Roskova, also referred to as Aconite, is played by Alexandra Serova. She is a secondary 'antagonist' in the later seasons of Mabel.

Seasons Five & Six
Aconite appears first in episode thirty-three, Primogeniture; she's monologue-ing about how no member of the Underhill is happy to see Anna or Mabel.

As the season goes on, it is revealed that she believes herself wholeheartedly to be the daughter of the King; however, she is mistaken. She was born in Russia to a political dissident father who died when she was a teenager under mysterious circumstances; she is taken to the United States-- Massachusetts-- to a boarding school called St. Olga's. After a confusing conversation, she is taken and tortured by Aurora Silver, eventually succeeding in contacting some form of god after being abused for an unknown length of time. After making contact, she ends up in the Underhill, suffering from amnesia. At some point after this, she challenges Anna's right to the throne.

After the Girls With Subzero Chill jog her memory, she drops her claim and apparently finds loyalty to Anna.