Rachel (レイチェル, Reicheru) is fictional character from the Ninja Gaiden series of video games by Team Ninja and Tecmo (Koei Tecmo). She was introduced in the 2004 action game Ninja Gaiden, where she is a human/demon hybrid who serves as a supporting non-playable character and an ally of the protagonist Ryu Hayabusa. Rachel is playable in Ninja Gaiden Sigma and Ninja Gaiden Sigma 2 (including their Plus ports for the PlayStation Vita), as well as in Dead or Alive 5 Ultimate, Dead or Alive 5 Last Round, and Dead or Alive 6, and as a guest character in Musou Orochi 2 Special and Warriors Orochi 3 Hyper. The character has been mostly well received, especially noted for her sex appeal.