Whether the superheroine/villainess is a mutant, an amazon princess or a Human Alien, if she's female, she is straining against the bonds of gravity... but not in a flying sort of way. This most common of metahuman attributes seems to range from a D-cup size upward for any character just past the onset of puberty (a time when many comic-book characters start to manifest superpowers). They are not only large, but remarkably self-supporting and perky for their size.