Sayori is portrayed as a talkative person, being very cheerful and kind and the archetype of a Genki Girl. She is very clumsy and notorious for finding ways to accidentally hurt herself or to drop things. However, despite being airheaded, she is rather cunning, being able to trick others just to get food. Sayori's depression makes her disorganized, and she often "cannot find a reason to get out of bed in the morning"; her room, which the protagonist regularly cleaned for her, is also noted to be untidy.