NYPD detective known for surviving terrorist attacks and saving hostages.
Karl's personal mission to kill McClane overrides his tactical duties, making him a primary physical threat.
Ellis's presence and subsequent death serve as a catalyst that hardens Gruber's tactics and raises the stakes for McClane.
Thornburg treats the crisis as a career opportunity, inadvertently aiding the terrorists and antagonizing the hostages.
Though physically separated, Argyle's actions in the garage directly support McClane's survival and escape.
McClane and Powell establish a critical communication link that bridges the isolated tower with external police forces.
The central antagonist and protagonist engage in a lethal battle of wits and firepower throughout the siege.
Explore the full interactive character relationship map of Die Hard