It all just comes to dialogue rather than design for me.
Personally the main issue for me is that, personalities have become too stereotyped. Lazies always think of bugs, Jocks always talk about muscles, Peppies and Smugs keep talking about their [nonexistent] popstar/acting careers, Snooties bragging about their purse collection, and Normal villagers are so sweet they are bland. I think Cranky and Sisterly are just right.
Although, if you keep talking to them several times, there are actually some good dialogue in there. Kinda wish you'd encounter those more than their generic ones.