“The captain says you're a friend. I will not kill you.”
―K-2SO to Jyn
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K-2SO (Kay-Tuesso), abbreviated K-2 (Kay-Tu or Kaytoo) or Kay, is a main character in Rogue One. She was a KX-series security droid originally created for use in the Galactic Empire's armed forces. He was part of the crew to find and and obtain the plans for the new weapon of the Empire called the Death Star.