Other than the Mario series, Charles has also done work for the video game "Cel Damage" as the voice of Fowl Mouth, as well as the primary voice work in several educational game series such as LeapFrog. He also voiced the dragon Paarthurnax in the 2011 video game "The Elder Scrolls V: Skyrim", and narrated the cutscenes and menus for the 2013 video game "Bit.Trip Presents Runner2: Future Legend of Rhythm Alien".