Nick Offerman

"Mike [Schur] pitched the idea that I just pop up out of nowhere. I never enter a room anymore. I just appear," Schwartz told Jimmy Fallon of Jean-Ralphio's "Muppet" evolution.

Let's take a look back at the most important faces on one of NBC's most-beloved sitcoms.

There were plenty of Christmas shenanigans in the show's seven seasons to look back on with cheer. 

From the broken coffee machine to the infamous libation, "The Fight" occupies a special niche for fans.

The duo was responsible for some of the hardest laughs in the iconic comedy series.

Here's what the epic chart is all about. 

The one-time deputy director of the Pawnee Parks and Rec Department had lots of advice for everyone.

From Tammy shenanigans to simply loving meat, the director of Pawnee Parks and Rec was endlessly quotable. 

Behold, the magic of NBC's Who Do You Think You Are?