The Marvel character with metallic skin is the Silver Surfer, a humanoid alien with a silver-colored body. He was created by Stan Lee and Jack Kirby and first appeared in the comic book series Fantastic Four in 1966. The Silver Surfer has the ability to travel through space on a surfboard-like craft and manipulate cosmic energy for various purposes. He is often seen as a heroic figure, fighting against evil forces and protecting the universe.