Karin Kudaka began her career employed by the Okinawa Tourism Association, focusing on enhancing local tourism through promoting regional attractions and developing visitor strategies. During this period, she forged connections with the staff of Gama Gama Aquarium, acting as a supportive figure who offered guidance and assistance to Kukuru Misakino and her friends in their efforts to sustain the struggling facility.

Following Gama Gama Aquarium's closure, she transitioned careers, resigning from the tourism association to join Tingarla Aquarium. Assigned to the marketing department alongside Kukuru, her tourism background proved valuable. She contributed to promotional campaigns, visitor engagement strategies, and event planning aimed at boosting the aquarium's profile and attendance, frequently collaborating across departments, including with animal caretakers, to align marketing initiatives with the aquarium's mission and animal welfare standards.

Her personality blends professionalism with approachability. She demonstrates pragmatic organizational skills honed in tourism, coupled with a warm, encouraging demeanor. This balance enabled her to mentor younger colleagues like Kukuru, helping them navigate workplace challenges and adapt to marketing demands. She encouraged Kukuru to leverage her deep marine life knowledge for visitor outreach, fostering a bridge between technical expertise and public engagement.

She functioned as a stabilizer within both community and workplace, facilitating communication and providing reliable support. Her relationships extended beyond professional ties, reflecting a genuine investment in others' well-being, particularly evident in her consistent encouragement of Fuuka Miyazawa and Kukuru during their transitions and challenges. Her name, meaning "summer" and "dignified/severe/cold," contrasts with her generally supportive and proactive nature.