Hiyori was said to have been a quiet and reserved girl. She is occasionally seen smiling whenever she happens to engage someone in a conversation who has a similar taste to hers in books. She cherishes her alone time, but also would like to befriend someone who understands her and shares her taste in books, which are mystery novels. She is astute as a girl and very soft-spoken; she is generally kind to everyone she meets and interacts with, but feels lonely occasionally.