Hawk is a formidable assassin and a central antagonist known for his immense physical power and relentless nature. His background is shrouded in legend; he is a former commando of such renown that he was once credited with single-handedly killing two thousand soldiers in a single campaign. Officially, he was declared killed in action thirteen years prior to the story's events during a special ops mission in Bermuda, where a bomb from a fighter plane was dropped on him. Miraculously surviving the explosion, he resurfaced under the moniker The Ghost of Bermuda, a name that kept intelligence agencies on alert for years. He eventually took on the guise of a lumberjack on a private estate, a simple life that allowed him to show a hidden, gentler side to a young girl named Salifa, for whom he cares deeply.

In terms of personality, Hawk is an implacable and stoic force of nature. He is defined by his singular focus on completing his contracts, showing little to no hesitation or remorse. His demeanor is calm and almost detached, whether he is cutting wood, enjoying a cigar, or engaging in deadly combat. He possesses a quiet confidence in his own abilities, often grinning with his metallic teeth in the face of danger. Despite his brutal profession, he accepts defeat with a sense of grace and sportsmanship, once lighting a cigar and acknowledging his opponent's superior skill without seeking petty vengeance. He speaks in a terse, direct manner, and his actions are guided by a straightforward, almost philosophical view of returning his targets to the soil.

Hawk's primary motivation is the completion of the missions assigned to him by an unknown master, who communicates through Salifa. He is hired to eliminate the master thief Lupin the Third, along with his partners Daisuke Jigen and Fujiko Mine. His motivations are professional rather than personal, though he appears to derive a grim satisfaction from testing his strength against worthy opponents. He views his targets as nothing more than material to be turned into fertilizer, a recurring and morbid phrase that underscores his utilitarian view of death.

His role in the overarching story is that of a near-unstoppable hunter who systematically dismantles the resources and confidence of Lupin’s gang. He first appears in earlier events by infiltrating a casino ship to destroy its engine, immediately drawing the attention of the samurai Goemon Ishikawa XIII. He tracks Lupin to his hideout, crashes his motorcycle through the window, and single-handedly forces the entire team to flee. He proves more than a match for Jigen, deflecting every bullet the sharpshooter fires and wounding him in return. His most significant role, however, is as the arch-rival and psychological breaker of Goemon, whom he defeats in their first encounter with humiliating ease.

Key relationships define much of his narrative. His bond with Salifa is the sole hint of warmth in his life; she is the one who delivers his contracts and the person he embraces upon seeing her, suggesting a paternal or protective affection. His primary adversarial relationship is with Goemon. Hawk shatters the samurai’s legendary sword and thoroughly defeats him, leaving Goemon haunted by visions of his own helplessness. This creates a deep personal vendetta, with Goemon seeking to avenge both his own honor and a person he failed to protect. Hawk also serves as a direct physical threat to Lupin and Jigen, treating them as obstacles to be removed rather than personal foes. Inspector Koichi Zenigata manages to briefly apprehend him, but Hawk escapes by effortlessly killing multiple officers, highlighting the vast gulf in their combat abilities.

Throughout his appearances, Hawk shows a disturbingly flat character arc, but one that is defined by his seeming invincibility and eventual, shocking defeat. He begins as an unstoppable legend who effortlessly defeats the entire main cast, breaking their weapons and their bodies. After being arrested, he breaks out of prison with sheer physical force, murdering many law enforcement officers in the process. His development culminates in a final, brutal battle with Goemon. Despite slicing a deep cut into Goemon’s back and demolishing a temple around him, Hawk loses his right arm. This loss is the first time he experiences true failure. Instead of raging, he calmly accepts his defeat, acknowledges Goemon as a worthy adversary, and tells Lupin he has an impressive bodyguard before walking away.

Hawk’s abilities are superhuman in nature. He possesses tremendous physical strength, allowing him to tear through a casino ship’s engine, smash a car with his axe heads, and single-handedly demolish a temple. He is incredibly durable, surviving an explosion that sends him through a roof and later relocating his own shoulder after a motorcycle crash with no visible distress. His primary weapons are his custom axe heads, which he wields with devastating speed and precision. He can deflect multiple bullets from Jigen’s magnum in rapid succession, using his axes as both shields and projectiles. He also has metallic teeth, a notable physical trait that adds to his menacing appearance. He is an expert motorcyclist, frequently stealing and using bikes as his primary mode of transport. In later events, it is implied that Hawk is a modified human, as his severed arm returns to normal and he reappears after his apparent death, suggesting he may have been replicated or resurrected.