Definitely Aurora! She was the first villager I ever talked to in my first-ever AC game (Wild World). She was in my town for a good 4-5 years, I think - but eventually moved :( However, I moved her into my ACNL town probably around a year ago. I was so happy to see her again. :)
As for...
My town is very woodsy and simple with lots of trees and bushes. I'm working on things like flowers and PWPs at the moment, and I've never really tried to coordinate my villagers with this sort of theme. ^^