Me and Pips were just talking TV. I mentioned that there were a select few actors who were 'icon' level characters twice. The list we came up with so far:
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Larry Hagman (Major Nelson and JR)
Mary Tyler Moore (Laura Petrie and Mary Richards)
Bob Denver (Maynard G. Krebs and Gilligan)
Don Knotts (Barney Fife and Mr. Furley)
Tony Danza (Tony Banta and Tony Miselli)
Jack Klugman (Oscar Madison and Quincy)
Andy Griffith (Andy Taylor and Ben Matlock)
who else is there?
(note: iconic characters who later had smaller roles don't count. I'm talking about people who were full fledged TV icons twice)