Rōze Kusano teaches the second-year Sunflower Class at Hanamaru Kindergarten. Observant with friendly curiosity, she particularly enjoys witnessing her colleague Tsuchida's attempts to catch fellow teacher Yamamoto's attention. Kusano's personality blends openness with a playful, teasing edge, most apparent in her interactions concerning Tsuchida's romantic pursuits. She shares a solid rapport with Kawashiro-sensei, and together they often collaborate in good-naturedly encouraging Tsuchida to confess to Yamamoto, though their teasing sometimes unintentionally heightens his embarrassment.

Her personal passions profoundly influence her character. Kusano possesses a strong enthusiasm for sports and physical fitness, coupled with a distinct preference for muscular men, exemplified by her admiration for figures like Arnold Schwarzenegger in films such as Conan. This preference directly shapes her educational philosophy. She champions instilling a love for physical activity from a very young age, believing waiting until high school would be too late. Consequently, her Sunflower Class activities consistently emphasize sports, featuring regular ball games, running exercises, and enjoyable physical challenges. She actively guides student development, notably coaching Koume for the kindergarten sports day footrace.

Her dynamic with Tsuchida evolves beyond initial teasing. Around chapter 85, romantic feelings blossom, culminating in a love confession in chapter 97, adding complexity to her role as an observer in his romantic endeavors. Physically, Kusano has blue eyes and blue hair. Available images suggest a somewhat shaggy hairstyle.