A category fraught with “Knowing it when it is seen”
For my purposes; Shiny is limited to clothing. When a being itself begins to shine or the clothing starts to move on its own, then we’re drifting towards this pole of the categorization space.
Shiny is a category of pin-up perfection for me; Goopy implies a much less tractable, dare I say more fluid set of interactions which are often more exciting because of how fantastical they are.