I love Marshal and Julian. I had them both in my last town, and it was a blast. The three of us were like a triangle of best friends. :3 I have Shep now, who is also a cutie. I'm pretty convinced that I'd love all of the smugs if I had them... they're just a really friendly personality type.
He's so colorful and full of energy. I simply couldn't imagine my town without him. I also had Keaton for a time and he was pretty rad too. But Pietro is my number one smuggy.
Smug is my favorite personality type, so it's difficult to pick just one. I suppose if I have to, my favorite is Pietro. As opposed to a lot of people, I don't dislike clowns and I think Pietro's colorful design is great. He's my next door neighbor in my horror-themed town, and he's a pretty great villager.
Other favorites include Eugene, Hans, Jacques, Julian, Lionel, and Lucha.