Bio: First appeared after she rescued Batman from the ice when he escaped from the Court of Owls. Later, it's revealed she and her brother Cullen live alone and had a troubled childhood thanks to their abusing father.
Harper fixes the Gotham power grids to provide for herself and Cullen. Harper and Cullen were rescued by Batman after they were attacked by thugs who wanted to hurt Cullen for being gay.
Harper wanted to repay Batman for this and tracked down his whereabouts through the sewer power grids and some online videos. Harper saw Batman fighting Tiger Shark and helped defeat him. Batman told Harper to stop helping him, but she smiled and refused.