Matsuko is a girl of average height and fair complexion, with shoulder-length dark brown hair (very similar to Yumi's) and brown eyes. As a high school student, Matsuko wears the standard female uniform. Matsuko seemed to be a cheerful and sociable person as she was often seen with many female classmates. She was apparently good friends with Yumi Ogura and Sachiko Nakajima. However, despite her friendly personality, it could be seen that she can be mad and mean sometimes.