Depiction in the series
Mr. Romero is the driving instructor of the Metropolis' DMV. When Diana was taking her driving test in order to help Karen, who had to wake up at 2:30 in the morning when she need to do things, Romero sat next to her to see how she was doing. During the test, Diana spotted Catwoman, Livewire and Harley Quinn going on a crazy joyride from a car they stole early and she forgoes her test to chase them. After crashing the car into the water, Mr. Romero told Diana she failed the test, but after she pleaded with him to retake it, he agreed under the condition she must drive in the normal speed and if she goes 1 mph over, he'll fail her. After Diana manages to defeat them by having them crash into a pile of trash and parallel parked perfectly, Mr. Romero passed Diana on her test.