Ron Swanson is actually the name of the character, played by Nick Offerman. Appearing as Leslie's boss, the Director of the Parks and Recreation department, Ron Swanson became a scene-stealer, slowly becoming massively popular on his own right. He might even be a cult character now, far more well known than the series itself.
Does this remind you of Barney Stinson, from the sitcom How I Met Your Mother? That was another character that simply shone far more than the other characters. So, why did Ron Swanson become so popular?
It's hard to say, but his manliness might have something to do with it. Ron is the embodiment of 21st century manliness, representing something primal in a world of increasing male metrosexuality. He is almost an anachronism with activities that are quite uncommon in the modern world. Difficulties with operating computers show us that he's quite the Luddite, and a passion for woodwork show us his respect for Mother Nature. And his moustache. It's got character. Ron Swanson simply represents something that is slowly dying and being lost to this world forever.