Jorok Goldblade
Member
Guess they're not using her. She may pop up again later. My guess is that they didn't use her because of how closely she ties into the Batman side of the DC mythos, they instead opted to use Nyssa. Much more creative freedom with Nyssa, that way. Considering how she isn't that popular. Also, Ra's has at least what, 10 kids (someone who knows more help me out!)? So I'd expect more to pop up throughout the series.
Ra's apparently has tons of kids, but only three are named characteres: Talia al Ghul, Nyssa Raatko, and Dusan al Ghul (an albino son known as the white ghost)
Comic Nyssa was born in 19th century Russia, and is a Holocaust survivor. They're definitely not going this route with Arrow Nyssa since we've seen her as a child when Malcolm began his training.