Every now and then, a character is introduced into a sitcom for a specific part and totally steals the show. Whether it's the actor, the character or the portrayal, there is something about them that is intensely memorable and hilariously funny.
A few immediately spring to mind - Keanu Reeves in Saxondale, Lord Flasheart from Blackadder and Father Noel Furlong in Father Ted to name exactly three.
The above mentioned can enter a scene, utter two lines and completely steal the show. Though by my definition, characters like Niles from Frasier, Trigger from OFAH and that retarded woman from Vicar of Dibley should be ruled out for hogging too much script time or appearing too frequently.
Based on the rules above who would be your favourite scene stealing little ray of comedy sunshine?