I would have to pick someone based on how amicable and well behaved they would be around a dinner table. Also it would need to be someone who doesn't have too high an expectation about what they are going to get. Perhaps Tom and Barbra from The Good Life.
Richard Castle for class perhaps, or Nina Proudman (although she'd be distracted all the while, for sure). But Harvey Specter or Donna Paulsen from Suits, would be heaps of fun. Mind you, Karen from Outnumbered would be insane as a dinner guest! I like Tom and Barbra from The Good Life too as well as Wilberforce Claybourne Humphries or Mr Humphries from Are you being Served?
Probably Richard Castle, because he's smooth. Or JD from Scrubs, because he's hilarious.
If only one, that would be Charlton Heston from 'The Colby's'!
If more, would add....
William Petersen (CSI)
Tom Selleck (Blue Bloods)
John Thaw (Inspector Morse)
Dame Maggie Smith (Downton Abbey)
Dame Helen Mirren (Prime Suspect)
Prof Brian Cox (Wonders of the Universe)
Prof Neil Oliver (Coast)
What interesting discussions all THOSE minds would make!
I'd be just so happy with this, but alas! unachievable, but nice to dream!
Don Diamont ( Bill Spencer)and Catherine Kelly Lang (Brooke Logan) from The Bold and the Beautiful, because they are both having the courage to do not give up on what they want and what keep their life going and most of all they are strong.