Sayori is initially portrayed as the character archetype of a Genki Girl, expressing a bubbly and cheery disposition. 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 by the protagonist to obsess over activities that she loses interest in later. She states that writing poetry and studying literature is different to her than those other interests because it helps her explore her feelings.