Joanna Dark, nicknamed Jo by friends, is the top agent employed by the Carrington Institute, specializing in combat, espionage, and undercover operations. She is the main protagonist of the Perfect Dark series, and plays a pivotal role in the events of the games and novels. She began as an enforcer agent with her father, Jack Dark, in the Dark Bail Bonds agency. She comes into employment with the Institute shortly after the events of Perfect Dark Zero. Her flawless performance in training earned her the call-sign "Perfect Dark".