Ya Ya is Rui Bu Si's roommate, a cheerful and sometimes naive girl. She owns a pet duck also named Ya Ya and a doll named Fufu. She sleeps in class and is afraid of Director Pa. She shares insider knowledge about Meng Academy with Rui Bu Si. She is loyal to her friends but can be indecisive. She talks to her doll and duck as if they are alive. She encourages Rui Bu Si and helps her adapt to school life. Her carefree attitude masks a keen understanding of people. She is a loyal companion throughout the story.
