The Human Vapor, in his humanoid form simply resembles a Japanese man, enveloped in a blue glow.
Mizuno was a former test pilot but retired after he was mysteriously infected and confined to a sanitorium for an extended period of time as a result. He later became a librarian until a man by the name of Dr. Sano offered Mizuno to become a "test subject" for scientist's projects. However, the tests backfired and Mizuno became an indestructible vapor man. He then began a life of crime in an attempt to support his girlfriend.
The Human Vapor is able to convert his entire body to a gaseous state at will. When in this form, he can wrap himself around people's heads, causing them to die of asphyxiation. He is also able to disappear into thin air.
- Main article: Human Vapor/Gallery.
- The Ultraman Gaia monster Wolf Gas is a partial homage to The Human Vapor, combining that character's gaseous transforming abilities with a more obvious werewolf motif 
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