Charlie Tho "Grim" Keng Boon is a difficult man to bond with, with a coldness that makes it difficult to understand him. He has a predatory disposition and a predatory nature, even during childhood. He used a strategy to kill an armed assailant, focusing on sensitive areas around the head. Despite his lack of sociability, Keng Boon demonstrates no discomfort working within a combat unit. Charlie Tho "Grim" Keng Boon is 5'10", 198lbs, and 39 years old, born on April 5th. He has light olive skin.