Sayori is a very bubbly, cheery, aloof, and affectionate girl. She is very clumsy, noted for finding ways to accidentally hurt herself or to drop random things. Regardless, she is shown to be a jokingly cunning individual who can trick others to get food, shown after managing to eat Natsuki's cookie without her permission. Sayori has also been known to obsess over activities that she loses interest in later. It is later revealed that she suffers from bad depression.