Ninja is an NPC that appears in the mission 'Double Cross' in the game Nightfire. He is the killer of Alexander Mayhew, and also the final boss the player has to fight at the end of the mission. Be prepared, as he is able to take multiple point-blank shotgun shots.
The ninja is a character with blood-red eyes and a dark, black suit. Next to his appearance in the mission, he is also selectable as an AI in the multiplayer options.