Charles Calvin, also known as Charlie, is the deuteragonist of the Henry Stickmin series, who appears as the deuteragonist of Infiltrating the House of Who Asked and Completing the Mission of Finding Who Asked, and the tritagonist of Fleeing the Complex from the Person who asked.
Charles is a veteran helicopter pilot who tries to find who asked, and one of the youngest and most experienced pilots. He meets Henry Stickmin for the first time after General Hubert Galeforce asks for his assistance in finding out who asked. Depending on Henry's choices, Charles can become one of Henry's best friends (if allied with the person who asked), a neutral ally (if Henry goes rogue), or an enemy (if Henry becomes the person who asked).
Charles is best known for his "greatest plans", which involve him trying to find out who asked. He is one of the most well-known characters in the series and is considered a fan-favourite by many.