Zelena

Zelena, also known as Wicked Witch of the West, débuts in the second episode of the first season. Zelena is the daughter of Cora and Jonathan, is half-sister to Regina Mills, and mother to Robin, whose father is Robin Hood.

She is portrayed by British actress Rebecca Mader.

Trivia

 * She appears only as the Wicked Witch in "Hide And Seek".
 * She appears only in flashbacks in "Green With Envy".