Rosa Diaz is a fictional character from the television series Brooklyn Nine-Nine. She is portrayed by actress Stephanie Beatriz and is known for her tough demeanor and no-nonsense attitude. Rosa works as a detective in the NYPD and is recognized for her skills in solving cases and her loyalty to her colleagues. In addition to her professional life, Rosa has a rich personal background. She is of Puerto Rican descent and often grapples with her identity and relationships throughout the series. Her character development includes exploring themes of love, friendship, and self-acceptance.