Lieutenant Simon "Ghost" Riley is a British special forces operator, and a prominent member of Task Force 141, known for his iconic skull-patterned mask.

Simon Riley had a very traumatic childhood while growing up in Manchester, England because of his heartless father. When hitting Roba, he was forced to flee when Washington turned up unexpectedly. Fleeing, he returned home to find Washington had killed his mother, brother Tommy, sister-in-law Beth, and nephew Joseph. 