Stephanie Beatriz was a standout as Rosa Diaz on Brooklyn Nine-Nine but many fans noticed a change in the character in season 4. Rosa is a cold and tough cop whose personality matches her aesthetic with her typically wearing jeans, biker boots, a neutral top, and a black biker jacket, with her curly hair loose. However, Rosa’s look in Brooklyn 99 changed over the years as she became more trusting of her colleagues. As the team grew stronger together, Rosa began to let down some of her barriers, which was represented visually by her new look in season 4.

https://screenrant.com/brooklyn-99-season-4-rosa-stephanie-beatriz-looks-different/