I am Ellen yin police detective with the Gotham City Police Department, formerly head of her department in Metropolis PD. She transferred to Gotham PD looking for a challenge (it is implied that she left Metropolis due to Superman's presence there). Yin is a career cop at the top of her game, simple and by the book. She is as physically adept as any male cop she knows, and has proven to be skilled in hand to hand combat.