Simon "Ghost" Riley is a quiet, reserved, and professional British Special Forces officer. He is known for his expertise in clandestine operations, sabotage, ambushes, and infiltration, and he maintains anonymity in the field through his signature skull mask. Despite his tough exterior, he is gentle and caring, deeply afraid of losing the few people he trusts. He is driven by a strong sense of duty and a determination to get the job done, even when faced with personal loss and trauma.