Charles Calvin, also known as Charlie, is the deuteragonist of the Henry Stickmin series, who appears as the deuteragonist of Infiltrating the Airship and Completing the Mission, and the tritagonist of Fleeing the Complex.

Charles is a veteran helicopter pilot who works for the Government, 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 bringing down the notorious Toppat Clan. Depending on Henry's choices, Charles can become one of Henry's best friends (if allied with the Government), a neutral ally (if Henry goes rogue), or an enemy (if Henry becomes the leader of the Toppats).

Charles is best known for his "greatest plans", which involve him trying to crash his helicopter (or another military-issued vehicle) into something. He is one of the most well-known characters in the series and is considered a fan-favourite by many.