Eddie Murphy - Mr. Robinson

If an impersonation counts as a character, I'd nominate Eddie Murphy as Stevie Wonder. I still sing "Ebony and Ivory" that he did with Joe Piscopo as Sinatra:

You are black
I am white
Life's an eskimo pie, let's take a bite
That was groovy thinkin', Lincoln
When you set them free.....

Also, I'd nominate Phil Hartman as Sinatra and Clinton.

ScottieK