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. Nanako cares a lot about right and wrong, but because she's a child, her sense is underdeveloped, making it a little rigid and failing to account for the big picture: when her father Dojima questioned the protagonist about having gotten into trouble by the police, Nanako would not only assume they're fighting, but would insist that when two people fight, it always means they're both in the wrong, as taught by her teacher. Prominent in her Social Link, her circumstances at home where the righteousness of her own personal feelings (to make others happy) and her father's responsibility to take care of his family clash between one-another.

Nanako's most notable quirk is her love for Junes, in both singing its slogan and in visiting their Inaba branch with her family and friends. Even when given the choice to pick a location for a vacation, her go-to answer is always Junes.