I think you're bending the term 'McGuffin' slightly past its limit. Originally it meant "interchangeable object of pursuit that drives the plot" - a secret docu

I think you're bending the term 'McGuffin' slightly past its limit. Originally it meant "interchangeable object of pursuit that drives the plot" - a secret document, a special microchip, a stolen diamond etc. Recently I've seen people using it to mean "contrived shift in the plot", but even then it seems wrong to apply that label to a person. Villain or antagonist maybe?