Borgoff is the leader of the Marcus clan, a group of bounty hunters hired to retrieve a young woman named Charlotte. He is the oldest of the Marcus siblings and assumes the role of the group's de facto commander, directing their actions and strategies throughout the hunt. His physical appearance is striking and brutal; he is described as a giant of a man with a face like a chunk of granite that has sprouted whiskers, and his body brims with an intensity that would likely make a bear retreat if encountered in the dark. He wears a protective covering of thin metal over leather from his neck to his wrist, though the mountain of muscles beneath this armor remains sharply defined.

In terms of personality, Borgoff initially shows a deep respect for the abilities of the dhampir hunter D when the two first cross paths, acknowledging his reputation as a formidable hunter. However, this respect curdles into intense hatred as the story progresses. His animosity is primarily driven by two factors: the perception that his sister Leila has developed romantic feelings for D, and the fact that D represents direct competition for the bounty on Charlotte. A deeply disturbing aspect of his background, present in the source novel Demon Deathchase, is that he and his brothers, with the exception of Grove, regularly assault Leila. This abuse gives them a warped sense of ownership over her, which further fuels their jealousy and hatred toward D when her attention seems to turn to the outsider.

Borgoff's role in the story of Bloodlust is that of a rival and antagonist to D. He leads his clan in a high-stakes race against the solitary hunter to capture or kill the vampire Meier Link and retrieve Charlotte. His primary motivation is the substantial reward for the job, but this professional drive becomes inextricably tangled with his personal vendetta against D and his desire to maintain control over his family unit. His key relationships are defined by this dynamic of control. He commands his brothers Nolt, Kyle, and the bedridden Grove, using them as tools to achieve his goals. His relationship with Leila is possessive and abusive, treating her not as an equal partner but as a member of the clan who exists under his dominion.

Borgoff does not undergo a significant positive development or redemption arc. Instead, his obsession and brutality intensify as the mission goes wrong and his brothers are killed one by one. After losing Nolt to the Barbarois assassin Benge and witnessing Kyle being butchered by the werewolf Mashira, Borgoff becomes increasingly reckless and desperate. His story culminates in a grim transformation; upon reaching the Castle of Chaythe, he is turned into a vampire by the ancient noble Camilla. In this undead state, he confronts Leila, only to be killed by his own brother Grove, who sacrifices himself to destroy Borgoff once and for all.

Borgoff possesses several notable abilities that make him a dangerous hunter. His primary weapon is a savage, primitive bow that resembles a snapped-off branch strung with beast gut. He fires simple iron rods filed to a point, and his skill with this weapon is extraordinary; he can shoot five arrows at once with the accuracy of a guided missile. One of his signature techniques is the chaser arrow, where he fires projectiles to drive a target into a precise position, only for two earlier shots to fall and pin the foe through both shoulders. Furthermore, Borgoff has unusual physical capabilities that suggest his parents had skill at genetic engineering. He can alter his legs to become gigantic, move with surprising silence despite his size, and even stick to surfaces to walk on walls or ceilings. An esoteric and costly ability allows him to project the image of an object he sees in the moonlight onto the clouds, though using this power is said to take three years off his life.