Description: Born in the city of Southtown, Blue Mary grew up with only her father in her life. With his time consistently taken by his occupation, however, Mary turned to learning the arts of Commando Sambo strongly influenced by her father who was a police officer of the city. Seeing the society that her father worked in made her also realize the reality of crime and injustice in the world.

Her training complete, Mary used her skills to become a secret agent, and was immediately placed to work on a number of missions with a young man named Butch. The two became a competent team, completing many cases, and bringing many criminals to the eyes of the agency. However, one day Butch was assigned to a case, and after a long time duration, he never returned.

Mary was devastated, not only by the loss of a person important in her life, but how she failed to uphold her duty. Determined to avenge him, Mary continued taking missions, becoming more and more famous. She began to travel the world, and in one case, met none other than the legendary "Hungry Wolf" Terry Bogard, whom she took a liking to and developed a strong bond with.