Sandman

Sandman is Flint Marko, a petty criminal whose molecular structure was transformed by a nuclear testing accident, giving him the ability to turn his body into sand — shifting, reshaping, and reconstituting at will. One of Spider-Man's oldest and most recognizable villains, Sandman has also served as an anti-hero and even an Avenger at times, making him one of Marvel's most morally complicated recurring characters.

Sandman Comics