The most beautiful female villagers I've had are Violet and Melba. I'm not really sure about male villagers since I've only had a few come through my town.
I'm probably in the minority when I say this but I really think Olivia is pretty. I love her little eyelash and her coloring. I kno not many people are fans of her for some reason. At least she isnt as bad as Monique the most handsome would have to be Fang or Wolfgang. They are just so majestic and pretty c: