In his roboticized form, Uncle Chuck has a light periwinkle metal frame where his fur would be and dark yellow plating on the tip of his feet, around his ankles, his hands, parts of his arms, and his muzzle. His eyebrows and mustache have become pale tan and his eyes have changed to soullless red.

Uncle Chuck is a highly intellectual and clever person and an outstanding knight which he gains the honorary title as "Sir" by the King. He is very devoted to his family and the children, especially his nephew Sonic, Sally, and their friends. He is as well a humanitarian who only wants to his intellectual potential to make inventions that serve the greater good.It is for this reason that he dislikes people who use his inventions for evil purposes.

When he was roboticized, Charles' personality changed into that of a mindless robot. While under the influence of Eggman's programming, Charles was shown to be wild and extremely hostile. When Sonic finally restored his uncle's free will, Charles regained his old personality.