Drusi is a significant supporting character from the anime Ranking of Kings: The Treasure Chest of Courage, who serves as the formidable personal bodyguard to Queen Hilling. He is a prominent member of the Bosse Kingdom's elite warriors, known as the Big Four, where he holds the esteemed title of the Queen's Shield. In terms of background, Drusi originally served a different role as the King's Spear, acting as the direct personal guardian to King Bosse himself. However, after the events of Miranjo's first rebellion, King Bosse reassessed his personnel. He concluded that Drusi's personality, defined by a strong sense of compassion and empathy, was better suited for a protective role rather than an offensive one. Consequently, Drusi was reassigned to protect the new queen, Hilling. Initially, Drusi perceived this change in duty as a demotion, feeling he had lost the king's trust and was being cast aside. He was given the chance by King Bosse to evaluate Hilling and decide if she was worthy of his protection. Though he was first put off by Hilling's blunt and awkward demeanor, he quickly recognized her genuine care for others and her dedication to her family. Concluding that she, like all people, deserved his protection, he accepted his new role with pride and became the Queen's Shield.

Drusi's personality stands in stark contrast to his intimidating physical appearance. He is a massive, broad-shouldered man with a bald head, thick eyebrows, and a notable scar on the left side of his mouth. Despite this fearsome exterior, he is an incredibly earnest, sincere, and loyal individual. He is known for being kind-hearted and emotionally sensitive, a trait that makes him an exemplary protector but was seen by King Bosse as a liability for a position meant for a cold and calculating attacker like his successor, Apeas. His core motivation is the protection of others. He takes his duty with the utmost seriousness and believes that everyone deserves to be protected, a conviction that drives him to fight without hesitation. His role in the story is almost entirely defined by his station as the Queen's Shield. Because his duty keeps him constantly at Hilling's side, he is largely isolated from the major political intrigues and court conspiracies, including the schemes involving the Magic Mirror and the succession conflict between Bojji and Daida. This means he remains unaware of many key events until they directly threaten the queen. When Miranjo returns and launches her attacks, Drusi becomes instrumental in the kingdom's defense, single-mindedly focused on protecting Hilling from the waves of underworld hounds and other assassins sent to kill her.

The most significant relationship for Drusi is with Queen Hilling. Their bond is formal and built on mutual respect, but it runs extremely deep. Hilling places absolute trust in his abilities, and Drusi repays this with unwavering and unfaltering loyalty, willing to sacrifice his life for her protection. Over time, a silent understanding and profound connection develops between them, transcending a simple master-servant relationship. His relationship with King Bosse remains one of deep respect and gratitude, even after his reassignment, as he understands the king was placing him in a role that matched his true nature. Drusi undergoes notable development through his fierce dedication. The most dramatic example of his growth and sacrifice occurs when he single-handedly defends Hilling from a pack of three underworld hounds, creatures that even his fellow Big Four member Apeas could not defeat alone. In this brutal confrontation, Drusi displays his superhuman strength and resilience, but he pays a terrible price, losing his left eye and his left foot. Despite these grievous wounds, he continues to fight relentlessly, even briefly resisting the giant warrior Gigan and managing to shatter the gigantes' massive warhammer in the castle courtyard. He subsequently receives a prosthetic for his lost limb, but his injuries do not diminish his resolve.

Drusi's notable abilities are centered on his immense physical power and durability. King Bosse himself has stated that Drusi is the sturdiest of the Big Four. He possesses superhuman strength that allows him to fight effectively while wearing exceptionally thick and heavy plate armor, which is thick enough to repel most physical attacks and would be too cumbersome for a normal person to move in. When the situation becomes dire, he has a signature technique of shedding this heavy armor by simply flexing his muscles and bursting out of it, dramatically increasing his speed and agility at the cost of some defense. In close-quarters combat, he is a devastating opponent, relying on brute force and tactical acumen. His primary weapons are a pair of spiked bucklers strapped to his forearms, which complement his hand-to-hand fighting style. He has demonstrated surprising finesse for his size, using tactics such as throwing his shields to bounce off walls and strike enemies from unexpected angles. His incredible resilience and willingness to endure any injury to protect his charge is, perhaps, his most defining ability as the true Shield of the Queen.