The Mad Giant-est

Science! An industry that has furthered our lives in many ways. It's what given us the tech, medicine, and lives of today.
Of course you know what a mad scientist, plotting world domination or something like that. But wouldn't you think it would be easier if you could, say, tower over everyone else.
These smarties had the same idea and decided to specialize in size-alteration. Shrinking or Growing, expect to see these geniuses rampaging through city, normal or shrunken. 
Interestingly enough, these types are also strong even at normal size, often being able to fight anyone in their way and don't always have to rely on a shrink ray. 
Despite the name being a play on "Giantess" and "Mad Scientist", the type is gender-neutral (though male versions are rare).