Author of Inkheart , offers a different take on the theme for younger readers. The Princess Knight - Books - Amazon.com
Princess Sapphire is born with both a "boy's heart" and a "girl's heart" due to the mischief of an angel named Tink. Frincess&Cnight
This work inspired legendary series like Sailor Moon and Revolutionary Girl Utena . Author of Inkheart , offers a different take