Bree and Penelope are the only good ones. Of the three, I like Penelope the most because she looks like a little gray human girl with a huge bow. I'd like her even more if her hair weren't so bright yellow.
I like Dora's color scheme the most but her face is just weird.
Bettina. I wasn't expecting to like her. I'd carefully built my house away from all the other houses so I wasn't constantly running into NPCs, only to have her plonk her house right next to mine. I thought those huge yellow ears were ridiculous when I first saw her. But her well-mannered way of speaking, slight anxiety and proper behaviour won me over. I can't imagine my town without her and her nebula tee now.
I like most of the females- Bella! But I haven't met many of the males. I can however, safely say that Limberg can take a hike, because we have a history dating back the Gamecube. He knows what he did, and he can stay out of my village.
Broccolo and Dora are the only mice I've had in the Animal Crossing series. I'm not a fan of them, though they are cute as a button. I did enjoy having Broccolo in City Folk over having Dora in Population Growing. He was a cutie. I'm going to try to get my Dream badges soon, hopefully I'll find a few dream addresses with Greta and Penelope. They seem pretty adorable and I'd like a chance to maybe have them in my town someday.
I've only ever had Rod, so I guess he's my favorite. I like him a lot though! He likes rock music and wants to be a pirate. How awesome is that? I've also really enjoyed him as a Jock villager since the concept of a tiny little mouse being so athletic and saying things like, "I could lift you over my head if I wanted to!" (even though he's half my size) is just so funny to me.
I've met Broccolo before in another town, and he's so sweet! I also like Bree and Chadder's designs.