Harper Row, aka Bluebird, is an engineering genius and a vigilante member of the Bat Family. She is good-hearted if sometimes cynical, and deeply protective of her loved ones. She's raised her younger brother, Cullen, after emancipating them both from their dangerous alcoholic father. Her mechanical skills allow her to create most of her own crime-fighting equipment, and a chance encounter with the Bat brought her into the Bat Family despite his initial reluctance to let her take on the risks.