Harley Hoover, recognized in Japanese as Hiromi Kashiwagi, is a classmate entwined with the protagonist’s social circle and maintains a close bond with Koichi Mizuno, the driven soccer team captain. His adventurous demeanor and tendency to deliver candid, occasionally critical remarks influence group dynamics, blending camaraderie with moments of tension. As a secondary figure, his narrative centers on school activities and peer relationships, with no exploration of his family background or personal history. His role remains confined to the primary television series, absent from expanded storylines or appearances in other official media.