Sunny is the daughter of Olga Gurlukovich. Olga gave birth to Sunny at a hospital run by The Patriots, who took the child away from her, and sent her a photograph of the child monthly. They later used this as a way for Olga to assist Raiden in the Big Shell Incident, if Raiden were to have died during the incident, then Sunny would have been killed by the Patriots. Olga eventually gave her life to protect Raiden, and the child who she never got to raise.
Sunny was later rescued by Raiden, who was badly tortured in the process. Solid Snake and Otacon proceeded to take care of her aboard the Nomad. As she was used by the Patriots as a computer worker, she had become a prodigy; she helped build both Metal Gear Mk. II and the worm cluster (known as FOXALIVE) that in the end shut down the Patriots AIs.
