In line with her age and grade in school she seems to demonstrate age appropriate behavior, such as watching shows starring Hideki Ryuga and asking Light for help with math homework, including quadratic function assignments. She seems to look up to Light, as she recognizes his intelligence and believes that he will become a quality detective. According to Death Note 13: How to Read, Sayu likes shoes and dislikes alcohol. In her university years, Sayu's attitude grows more mature, and she studies on her own without Light's help.