ファイ

Phi is a player in the Nonary Game: Ambidex Edition. She first appears in the Elevator along with Sigma and seems to know him, or at least his name. She like everyone else was kidnapped after a cloud of white smoke engulfed her knocking her out, forcing her to participate in the Nonary Game.Generally Phi is rather cold, methodical, and not to mention curt. She does not trust everyone and is willing to betray others to preserve herself. Phi possesses a vast amount of intelligence including philosophical topics such as Shrödinger's Cat and even basic Latin words and phrases.[From Zero Escape Wiki]