Ryuko is a demigoddess, and the 18 year old daughter of David Thatcher "Solid Snake" and Yoko Ritona. After Chaos' destruction in the 2160s, when the original Blue Team ascended to godhood, she was born for the purpose of inheriting the mantle with the rest of Blue Team's offspring. She is a member of the Second Blue Team, with the role of a skilled swordswoman. She is the sister of Zero.
Ryuko is medium-height, well-built, and well-formed, like her mother. She is thin at the waist and wider at the hips. She has bright blue eyes, and jet black hair with red streaks. She bears resemblance to her mother, but also has an appearance all her own. She is a very skilled sword-wielder, one of the most fearsome warriors ever to fight for good.