Sigma looks like a man in his early 30s in fact he's much older. He has teal shoulder-length wavy hair and red eyes. Wears elegant suits in public along with leather harness that curves his neck and torso. He is an artificial form of life, so-called segment of a scientist named Dottore (originally Zandik), the second of the Fatui Harbingers. Sigma works with papers, deals with financial management of the research department and works as healthcare minister of Snezhnaya.