Haru Yamato, born in Japan, relocated to Santa Monica, Los Angeles, California, where he grew up and cultivated a passion for breakdancing, winning several competitions. Initially disinterested in futsal, his perspective shifted dramatically after witnessing Japanese player Tokinari Tennōji execute an overhead kick during the U-18 World Cup final. Inspired, Haru returned to Japan to enroll at Koyo Gakuen High School specifically to join its futsal club.

He possesses a bright, straightforward personality and makes friends easily. However, he frequently clashes with teammate Seiichiro Sakaki, who often ignores his requests for passes during matches. Haru sports short red hair, red eyes, and wears two sky-blue charms on his left hand. His profile notes his height as 169 cm, weight as 55 kg, blood type A, and birthday October 20. His hobbies include collecting regional character merchandise and dancing, while he favors hamburger steak and dislikes sticky foods or meticulous tasks.

His family background involves a complex relationship with his father, Arashi Yamato, a former Japan national futsal team player who now coaches children internationally. Haru resided with his grandmother at one point. An American friend named Jay (Tonio in the anime) introduced him to the pivotal U-18 World Cup match that sparked his futsal interest.

As a futsal beginner, Haru initially lacked experience but compensated with high physical agility honed through dance. Playing as a pivot, he rapidly developed his skills through dedicated training. His growth encompassed learning teamwork dynamics, navigating his rivalry with Sakaki, and forming on-court combinations like a coordinated move with teammate Ryu Nagumo. His journey focused on overcoming early setbacks, building team trust, and striving to step out from his father's legacy in the sport.