Many fans noticed a Rosa Brooklyn Nine-Nine season 4 change in how the beloved character looked. Rosa was introduced as a cold and tough cop and she matched her personality with her aesthetic, typically dressing in jeans, biker boots, a neutral top, and a black biker jacket, with her curly hair loose. However, Rosa's demeanor in Brooklyn 99 changed over the years as she became more trusting of her colleagues, confident in knowing that they wouldn't judge her regardless of her choices. As the team grew stronger together, she became much more open about her struggles, realizing that she didn't have to always put on an unbothered front, changing the Rosa Brooklyn 99 season 4 look.
https://screenrant.com/brooklyn-99-season-4-rosa-stephanie-beatriz-looks-different/