Eric Idle for me - at any age. Only partly because of the PC game, and really mostly because of his portrayal as Sir Robin the Not-Quite-So-Brave-as-Sir Launcelot in "Monty Python and the Holy Grail"

Minstrel: [singing] Brave Sir Robin ran away...
Sir Robin: *No!*
Minstrel: [singing] bravely ran away away...
Sir Robin: *I didn't!*
Minstrel: [singing] When danger reared its ugly head, he bravely turned his tail and fled. Yes, brave Sir Robin turned about, and valiantly, he chickened out. Bravely taking to his feet, he beat a very brave retreat. A brave retreat by brave Sir Robin.