Oh jeez, that's tough! Design wise, I'd have to say Erik. He's a cute lil moose who makes this Canadian happy :3
As for personal value and attachment, I'd have to say it's between Biskit and Teddy. I don't have them in NL, but in WW, they were my best friends. I only talked to them out of everyone else in my town!
i fav is Rosie. she moved in pretty fast in my first game and she was my bestie. she hosted all my b days. i will always want her in my town from now on.
zucker, marshal, beau, cube, flurry, skye, freya, wolfgang, hans, boone, kid cat, julian, rocket, fauna, static, lolly, rosie, tipper, stitches. i have a lot of favorites but imma just name some.