Who was this antagonist of The Burger King in the franchise's long past children-oriented TV ads?

While Sir Shake-a-Lot was a denizen of the Burger Kingdom, the Earl of Envy & Count Cumbersome are made up because of a near total absence of campy satirical aristocratic characters anywhere comparable to the Duke of Doubt, a nasal & reedy-voiced loveable loser who always got some comeuppance in his appearances in kids'-oriented TV ads from the late 1970s to the mid 1980s.

Contemporaneously, Burger King's adult-oriented TV ads revolved around a sung jingle based on the slogan 'have it your way at Burger King'.