A member of the "Library Trio" along with Nodoka Miyazaki and Yue Ayase, Haruna comes off as the most upbeat and energetic of the three. Although she gets along with Negi from the start, her feelings never quite get to the level of "Love," content with letting her friends have their shot. She's also an aspiring manga artist, specializing in "adult" stories.

Despite not being romantically attracted to anyone, Haruna seems to have the odd ability to detect when someone around her is in love by using her bangs like antennae. She also claims that love itself has a scent akin to rotting candy almonds, which she calls the "love reek."

Her breast size in class appears to be ranked 5th.