Detective Mike Logan (Chris Noth) -- just the right mixture of sensitive guy and surly macho!
Detective Lennie Briscoe (Jerry Orbach) -- Oh Lennie, Lennie, how I miss your cynical, wisecracking ways!
Executive Assistant District Attorney Jack McCoy (Sam Waterston) -- He's the reason I started watching Law and Order in the first place. I love a good tenacious, crusading lawyer! When he got moved to the role of District Attorney a couple of years ago and got less screen time, I think the show lost its heart and soul.
And of course, the real star of the series -- that fabulous opening theme song!