Boscone is the formidable general of the Purple Rhino Knights, recognized as the most powerful and elite military force within the Chuder Empire during the Hundred-Year War. Stationed at the formidable fortress of Doldrey, which Chuder had seized from Midland decades prior, Boscone is a veteran warrior whose reputation for being undefeated precedes him on the battlefield. His physical presence is as imposing as his status; he is never without his elaborate suit of silver armor, which juts outward in sharp spikes at the shoulders and elbows, creating a grand and intimidating aura. His most distinctive feature is his rhino-shaped helmet, and underneath it, he has no hair and coarse, rugged facial features. His purple coat is only visible as a collar around his neck.

In personality, Boscone embodies the ideals of a disciplined and honorable soldier. He is a man of few words who prioritizes fulfilling the orders of his superiors above his own initiative, even when he knows their commands are tactically flawed. He displays unwavering bravery and valor on the battlefield, and he harbors a deep contempt for cowards. He particularly despises officers like Adon Coborlwitz, who let their men fight and die to save their own skin. Despite his fierce exterior, Boscone is not a mindless brute; he is an excellent tactician with a sharp, analytical mind, capable of reading the flow of battle and anticipating enemy strategies.

Boscone’s primary motivation is the defense of the Chuder Empire and the execution of his duty. He is a career soldier who seeks to defeat Midland’s armies through direct, overwhelming force and sound strategy. His role in the story is that of the final, most powerful human obstacle standing between the Band of the Hawk and the recapture of Doldrey. During the battle, he quickly discerns the true nature of Griffith’s strategy to lure the Chuder forces away from the fortress, but his hands are tied by the chain of command. His key relationship is with his superior, Governor Gennon, whose obsession with capturing Griffith alive leads him to override Boscone’s tactical objections and order a full, reckless pursuit. This forced obedience ultimately leads to the downfall of his army. He also shares a brief but intense adversarial relationship with Guts, whom he correctly identifies as the legendary "Hundred Man Slayer" after exchanging only a few strikes.

Boscone shows little personal development, as he is a fully realized and experienced commander whose defining tragedy is being destroyed by the incompetence of his superior rather than a personal flaw. His role is to serve as a powerful foil to the Band of the Hawk, demonstrating that individual skill and loyalty cannot always overcome poor leadership. His notable abilities are considerable. He is recognized by Guts as a foe "worse than fighting a hundred men," and his physical strength is immense, allowing him to bisect multiple soldiers with a single, effortless swing of his bardiche pole-axe. He wields this iron weapon with deadly precision, even while mounted on a horse equipped with formidable barding. In the film, his final duel with Guts is a brutal, even match in which he succeeds in pushing the swordsman to his absolute limit. However, unlike in the original manga, Guts’ sword never breaks, and the immortal apostle Zodd does not appear. Instead, Guts is able to create an opening by using a broken banner as a distraction, ultimately decapitating Boscone and his steed in a single, decisive counter-blow. His death shatters the morale of the Chuder forces and seals their defeat, bringing an end to the century-long war.