Sofia is a voluptuous private detective and former KGB agent suffering from amnesia. She entered the first Toshinden tournament to recover her past and eventually learned that her memory had been tampered with by the Secret Society. When she heard that another fighter, Chaos, was suffering from the same fate as her, she entered the second tournament in hopes of saving him. Although she was unsuccessful in her mission, she managed to help bring down the fall of the Secret Society. Sofia would eventually discover that she was being targeted by the Organization, and she entered the third tournament hosted by it, in order to help destroy the Organization. Even though Sofia had realized that she would never get back her old memories, she decided to move on and create new memories so that can finally be free from her personal sorrow.