Nanako is a mature and kind person for a girl her age though has moments of childish innocence such as when she wonders if the weather reporter "decides" the weather. Her refreshingly honest way of thinking and speaking is noted by many characters in the series. She is selfless and tries her best not to hurt anyone's feelings, such as when she stomached all three of the omelets made by the Investigation Team girls and stated that they were all good, despite clearly having some distaste to them. She tends to be shy around strangers, but becomes friendly once she warms up to them.