My favorite is Peppy, but I also like normals, snooties, and crankies. I like the peppy personality because peppies are quirky, upbeat, and fun to talk to. I really like the normals, for they are kind and caring. The snooties are a bit more refined than the normals, but they still care about the player. I like the crankies because they are like a fatherly figure, but they aren't overprotective.
My least favorite is the jock personality, because they mostly just talk about muscles and working out.
Normals. They make me feel happier, and I can easily relate to them.
I like them all though, even the jocks can bring up interesting conversations; in Animal Crossing there are two jock villager conversations about money rocks, the City Folk one is much less bland than the New Leaf one.