Sorry if this has been done before but . . .
Is it manic Basil?
Organising Martin?
Scheming Blackadder?
Grumpy Victor?
Me, Jim Royle.
Me to a T
Who do you most identify with?
Hmm. Daisy Steiner quite often.
And maybe Caroline Todd in Green Wing.
Moe Syzlak 
It used to be Shelley (though I probably more resembled Timothy Lumsden). These days Philip Roath.*
*It Takes A Worried Man
I'm much the same as you Oldrocker.
I wouldn't say I identify with these characters - but I have been identified by my wife/children as these characters.
Started with Dan Conner from 'Roseanne'.
Then Homer and Victor and Jim Royle. D'oh!
Daisy Steiner, Mo Syzlack, Phillip Roath? Can people put the shows they are from please. I myself would veer from Harold Steptoe (Steptoe & Son) to Rab C Nesbitt (Rab C Nesbitt) depending on period, mood etc, although not as extreme as either. Always wanted to be a Terry Collier really but alas I'm not.
Joey Tribiani (Friends) for his love of sandwiches.
Liz Lemon.
Jeff from Coupling. With a smidge of Jim Hacker.
Quote: Alfred J Kipper @ July 2 2011, 11:04 AM BSTMo Syzlack
Social outcast barkeeper in The Simpsons
I'd love to say Vince from 'Just Good Friends', but in reality it's Moss from 'The IT Crowd'. 
Dawn from The Office with a bit of Alan Partridge thrown in.
Ooh, Liz Lemon, yes. (From 30 Rock.)
(And Daisy Steiner is from Spaced.)
Ace Rimmer.
I'm a bit too perculiar to be a successful sitcom character.