Todd Hiett’s Big Idea- BLACK BAT AND SPOILER:
First, it’s so damned obvious as a great modern analogy to Batman and Robin. Two women whose connection is being raised by bad people and turning to the Bat-legacy. One’s experienced and world class, the other is a great fighter with an indomitable will to win. One is dark and emotionally vulnerable, and one is light and optimistic. They both worry about each other, and also in-fight like real sisters.
In plain-clothes, Cass is aloof and somewhat clumsy. Steph is totally boy-crazy and is also very appreciated by men-folk. Both worry and drive each other mad as a result. I see them as world-travelers on the Batman payroll, fronting as young auditors on the Wayne International scene, allowing them to cross borders with regularity. Their primary objective is dismantling and unmasking sects such as League of Assassins (a personal mission for Cass), KOBRA, and such. Sometimes, the goings-on at Wayne Intl. wind up complicit in their cases.
Also in my world, they have a traveling partner, Zinda Blake, their pilot. Bruce has recruited “Lady Blackhawk”, whom he met during his young globe-trotting days, not just to fly them around but also to watch their backs and work in the mobile crime-lab and serve as a maternal Alfred figure to them.
Better idea than anything DC Editorial has ever come up with.