Sunny
a.k.a. Санни Гурлюкович (Russian)
Nationality: Russian 
Born: 2008
Family: Olga Gurlukovich (mother), Sergei Gurlukovich (grandfather), Hal Emmerich (guardian)
English voice actor: Christina Puccelli
Japanese voice actor: Kikuko Inoue
Motion capture actor: Yasuyo Nabeshima
This biography contains spoilers from Metal Gear Solid 2 and 4. You may not want to read this, if you have not yet played these games.
Biography
Olga Gurlukovich gave birth to Sunny at a hospital run by the Patriots, who took her child away straight away and every month, Olga received photographs. Forced to comply with their demands, Olga assists Raiden during the Big Shell Incident making sure he didn't die as Sunny would receive the same fate. At the end of Metal Gear Solid 2: Sons of Liberty (MGS2), Olga gives her life to protect Raiden and asks Snake to take care of her daughter. Sometime after the events of MGS2, Raiden rescues her from the Patriots but it is unclear exactly what happened during this time.
Taken in on the Nomad by Snake and Otacon, the latter who acted as her surrogate father. Now seven years old, Sunny helps Otacon with the Metal Gear Mk. II and Metal Gear Mk. III. During this time, Sunny becomes a child prodigy in computer programming and often helps Otacon. Later on, she finishes the FOXALIVE worm cluster used during the finale of MGS2. After been in hiding since her rescue, she portrays no socials skills or experience in the real world, just great knowledge of computers.
She enjoys cooking eggs for Snake and Otacon. In the beginning, they would burn (much to their disgust) but after a lesson from Dr. Naomi Hunter, she becomes very good at making them. Naomi also helps her cure her stutter. Sunny uses her cooked eggs as a form of fortune telling; if the eggs turns out good, the upcoming mission would be a success.
Facts
- Since Japanese is a gender-neutral language, she was referred as a "him" in MGS2
- Sunny plays Penguin Adventure on her PSP and also uses a Playstation 3
- The duck Sunny uses to time her eggs can be bought as MGS4 merchandise