Mist

Real Name: Unknown
First Appearance: Top-Notch Comics #16 (June, 1941)
Original Publisher: MLJ
Created by: Al Camy, Harry Shorten

Origin: 

The Mist was a thief and killer who wore a "Molecular Disintegrator" belt, which allowed him to turn his body into a gasseous state. In this state, he was impervious to fists and bullets and could escape through even the smallest crack. He could also fly and carry small objects in this state. However, to make attacks, he had to become solid.

He usually carried a dagger on him, but he was also known to use firearms. He battled The Black Hood on several occassions.

Golden Age Appearances: 

Top-Notch Comics #16

Jackpot Comics #3