That recent thread on Tamariz got me thinking...
Part of what I think makes Tamariz effective is that based on a first impression (manic, older fellow--to paraphrase Dustin), you'd never think he'd fool you so badly.
The perfoming personas of Bro. John Hamman (quiet, Midwest gentleman), Bob Sheets (fun loving, jovial, clumsy guy) are completely different; yet, they also come to mind as guys you'd never suspect are devious geniuses.
They are much different from a Darwin Ortiz, Derek Dingle, Martin Nash, Michael Skinner, etc. You pretty much expect to be fooled by those guys from the get go.
So..who are your favorite magicians whose performing personalities most greatly belie their skill and cunning?