Probably Midge. The first time I ever played AC, on the GC, Midge was in my town. She was the only villager I ever talked to, and she became my best friend in the game. Sadly, my brother made a new town because he got bored, and Midge was gone. But, when I played CF for the first time, Midge was one of my starting villagers. I still loved her death, and we were best friends again. She's still in my City Folk town, and now I have her in New Leaf thanks to a very generous TBT user. <3
So, yeah, Midge is my favorite villager. Design-wise, Kabuki takes the cake, though. Also, I just restarted the GC game for the fun of it, and Midge moved in today.
Julian.
As weird as this seems, he actually sent me something darn close to a love letter right after I had a terrible breakup with someone really close to me, even though Julian often walks around with Diana and I shipped them until Fang came along and basically took Diana from Julian.
Guess what was in the present attached to the letter?