Roseanne always had great grades, great hair, and always had great supportive people around her at all times. Once Roseanne had heard about what happened to Chris and the Academy Dudes during the killing game, she instantly felt horrible. She really did try her best to figure out what happened to the students at the Academy, but she geuinely wishes there was more she could've done. Later in the future, Chris and her grew even closer and would eventually become Christina's manager. She helps her find gigs and helps her image stay relevant in her days of being away from the camera.
Roseanne's Origins:
Roseanne was made to fill in the student count of the Rival School, which would eventually be included within the Epilogue of DR:K2, and other future projects such as DR:K2.5. Roseanne doesn't have a particular reference in her character, but Komasan really wanted another Blonde character for the cast.