Sunny Emmerich

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. The identity of her Father is unknown.

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. She enjoys making eggs for Snake and Otacon; which she used as a kind of fortune telling, calling it her "Sunny Side Up" fortune telling. If the eggs turn out well, the group's current mission would be a success.

Sunny had been in hiding most of her life, having little to no socials skills and no experience of the outside world beyond computers. Somewhat fittingly, Otacon acted as a surrogate father, and she inherited some of his mannerisms. She has a very pronounced stutter that slowly fades after befriending Naomi Hunter. She was also very protective of Raiden and Snake, the latter she would often chastise for his smoking habit.

After The Patriots were destroyed, Sunny found her first "outside" friend, a local boy, at the wedding of Meryl Silverburgh and Johnny Sasaki. The boy didn't speak English, but she had fun playing with him anyway, and gave him the Metal Gear Mk. III as a present. In the end, Sunny decided to accompany Otacon in witnessing the final days of Solid Snake.

Behind-the-scenes
Due to the gender-neutral nature of the Japanese language, Sunny was referred as a "him" in Metal Gear Solid 2: Sons of Liberty.