There will be tons of comparisons between Andy Herrera and Meredith Grey. They're both smart, talented, and deeply inclined toward pensive voice-overs. Still, there's an immediate rawness and bluntness to Andy that we don't see in Meredith until later seasons.
Unlike Meredith in the Grey's pilot, Andy knows what she's doing. She's fairly confident about her job, even obstinately ramming a police car that's parked in her red zone. She speaks up on her own behalf when her father plans on passing his job to the guy who unsuccessfully proposed to her.
While she's a badass heroine who runs into fires, Andy also has a disarming vulnerability to her. Not too long into the first episode, we see her crying when she finds out that her father, the fire department chief, has been hospitalized after collapsing during a fire. Andy shares something of a complicated, loving relationship with her father. He's her mentor, but she also has to take care of him at home. So far, the dynamic is way less dark than Meredith's twisty relationship with her mother.