Harley Quinn and Batgirl are the only constants in multiple ‘Birds of Prey’ scripts

According to Variety reporter Justin Kroll, there are multiple versions of the Birds of Prey script. Each version contains different characters, the only constants between the two are Harley Quinn and Batgirl. So for example… version #1 could include Harley, Batgirl, and Catwoman, while version #2 could include Harley, Batgirl, and Poison Ivy.