Any combo of Barbara, Helena, Cass, and Steph; I feel like the batgirls are always vaguely in the background of reverse robins AUs. Give me a reverse Batgirl AU where they can be the focus! (Including Helena as a Batgirl because a) I love her and b) to make things a little more crunchy so that Cass just doesn't end up the same when you flip them)