This is a character with the following traits: * A mercenary, bounty hunter or assassin. * Antagonist sent to capture/kill protagonist(s) * Relentless in pursuit of protagonists. Usually a Determinator, often an Implacable Man. Sometimes the protagonists will try to pay him off, but he'll always ignore the offer and get killed off. * Mysterious in one or more gimmicky ways. Sometimes he's The Faceless, sometimes The Voiceless, sometimes he isn't named except in an Everyone Calls Him "Barkeep" way, sometimes he wears a concealing suit of armor, sometimes he has an unexplained facial scar, sometimes he turns out be a she...