Charlie appears to be the classic young WWI Digger - the kind of naive but decent young man that the Anzac myth was built on. However Charlie is privy to secrets that he will learn are deeply shameful. While he's resourceful and sensible, Charlie's desire to seek guidance can see him sway and take orders readily.
In the 21st century, Charlie strikes up a strong friendship with Kirstie, who is drawn to Charlie's warmth and gentleness.