Hayami is a very stoic, businesslike and professional girl who has been compared to a working adult along with Chiba. As a result of her serious demeanor, she can be quite straightforward and direct. In her initial appearances, Hayami was shown with a much more mild personality, conversing and even smiling with other students, but gradually became more stoic. However, she secretly has a much softer side to her personality, as shown in a picture of her cheerfully holding a kitten.