That [Superman] gets his science-defying powers from a yellow sun, or loses them in the presence of a red sun, are stereotypical devices to quickly explain why the hero does or does not have powers.
A stereotype, or stereotypical device, is identical to what I called a "simple variable" in this essay. For my purposes a simple variable is any item, event or entity within a narrative that is as close as one can conceive to a bare function; one that is static with respect to associative links to other items, events, or entities.
An archetype is equivalent to what I have called a complex variable, following Northrop Frye's logic on this subject. A complex variable is any item, event or entity within a narrative that proves itself dynamic with respect to associative links to other items, events, or entities.
Therefore in my schema:
A stereotype is defined by bare functionality.
An archetype is defined by some degree of "super-functionality."
I suppose I could call it "surfunctionality" if I wanted to distance it from the various "supermen" associations of Nietzsche, Shaw and Jerry Siegel. But that would be an elitist's consideration.