Harley Quinn cameos in new Arrow trailers: Trailer 1 Trailer 2
Now I’ve seen people asking who is playing her, and the name that I found pop up the most was Cassidy Alexa, and her twitter is here, where she has retweeted many people congradulating her on the fact. She hasn’t been in any films according to IMDb, but she is a model and a ballerina.
The promos are for episode 2x16, but I haven’t found any information indicating that she will appear. Let’s hope!
Gif credit to: x