Haru Glory is the main protagonist of his story and the central figure chosen to wield the sacred power of Rave. He originally comes from Garage Island, a remote and isolated place, where he lived with his older sister, Cattleya, after their mother passed away and their father, Gale, disappeared. Because of his upbringing in such a secluded environment, he initially lacks knowledge of the wider world's history and geography.

In terms of personality, Haru is defined by his strong will, good heart, and an unwavering sense of justice. He is a kind and compassionate individual who often acts on his emotions, leading him to be both hot-blooded and somewhat naive. Despite a tendency to rush into situations headfirst, he is a technical pacifist who firmly believes in avoiding unnecessary killing and always looks for the good in others, even his enemies. He is also fiercely protective of his friends, a trait that becomes his greatest source of strength.

Haru's primary motivation is to protect the people he cares about, especially his close companion, Elie. While he is dedicated to the mission of destroying the evil Dark Brings and stopping the terrorist organization Demon Card, his personal desire to keep Elie safe from harm is what truly drives him to overcome impossible odds. He is a determined fighter who never gives up, no matter how badly he is beaten or outclassed.

Throughout the story, Haru serves as the inheritor of the title Rave Master, a legacy passed down to him by the previous master, Shiba. His role is to gather the scattered Rave Stones and use their power to combat the forces of darkness threatening the world. As he travels, his magnetic personality draws many allies to his side, forming a group known as the Rave Warriors. Key among these relationships is his bond with Elie, a girl with amnesia whose mysterious past is tied to the Rave Stones. Their partnership deepens into a romantic connection, with Haru eventually confessing his love for her. He also forms a strong friendship with Hamrio Musica, a silver-wielding thief who becomes his closest ally and confidant. His relationship with his own family is also significant, as he seeks to understand why his father left and confronts the man who killed his mother, King.

Haru undergoes significant development as the story progresses. He starts as a relatively inexperienced boy who struggles to control his inherited sword, the Ten Commandments. Through his journey, he matures into a true hero. A pivotal moment in his growth is a ceremonial duel with a young Shiba, during which he must find his own personal reason to fight. He realizes that his strength comes from his desire to protect Elie, solidifying his resolve and allowing him to fully inherit the power of Rave. He also learns to master his emotions, particularly when using the dangerous and rage-fueled form of his sword, Sacrifar.

His most notable abilities are tied directly to his role as Rave Master. He wields the Ten Commandments, a powerful magical sword that can transform into ten distinct forms, each with unique properties. These forms include Explosion, which creates powerful blasts; Silfarion, which grants incredible speed; Rune Save, which can seal magic; Blue Crimson, which controls fire and ice; and Million Suns, which harnesses holy light. Haru is able to instantly learn how to use these forms thanks to the Rave of Knowledge, a special stone that grants him insight and skill whenever necessary. Through the Rave Stones, he possesses the power to nullify and destroy Dark Brings, making him the only one capable of stopping Demon Card's ultimate plans.