Yes, there must be some theatrical slang or argot for the type of performer who enters the stage in one guise only to completely reverse this perception before the grand finale. Is there a dictionary or glossary of terms from the show world? Henry Mayhew had lists for the types of criminals and beggars in 19nth century London. A friend of mine has an encyclopedia of underworld argot that records thousands of expressions from as far back as the 18nth century. I often try to buy this off him when he's drunk.

I've either seen or read of frail and timid old ladies who sling off their sad coats to be revealed as young show girls who dance up a storm. There are precarious drunks who turn out to be expert marksmen, knife throwers, acrobats, or equestrians.  Moving from variety shows to plays and films, there are vulnerable, drunk old men who fall victim to gamblers only to turn the tables and win back everything and more. These types evolve upwards into Zorro, the Scarlet Pimpernel, various spies, gentleman cat burglars.  And these, I think, evolved or were modernized or pomodernized into the constellation of super heroes who Clark Kent, or Peter Parker, or Bruce Wayne it by day, and then strip down into caped crusader togs when the feathers hit the fan. These types evolve downwards into various psychos and nightmare types descended from the little old lady AKA wicked stepmother who sold Snow White the apple, all the way to Tony Perkins, prop. Bates Hotel.

There's something exhilarating about an entity changing into its reverse. It's an action that releases an explosion of power one way or another. When the change is from weakness to strength, I think it triggers an unconscious desire, or hope, that one day we all may excel ourselves and be revealed as more than what we are.

But the sudden change of a person one knows and for whom one feels love, such as a mother, or one's child, into a diabolical persona, is a universal dread that's fueled changeling stories, vampire tales and lycanthropy and zombie legends in probably every culture in the world.

Probably the example that may have usually been uppermost in VNs mind was lepedopteral mimesis, where the humblest moths and butterflies could acquire the most elaborate disguises to survive

AB