Chevre, for the reason that she was one of my first in Wild World, and just captivated me. She's so sweet, and so adorable. I love her to death. Same goes for Marina, but I don't have her right now orz
As for newer ones, uh... Like... All of my dreamies. Freya, Beau, Fang, Flora, Gladys, Fuchsia, Phoebe... and the rest of em. I get really super attached to my dreamies, and I adore them to bits and pieces. Every time I TT, I get nervous that one of them will ask to move or move without warning ;_; I don't think I've ever been this paranoid, but it's probably because I have two (will be three) games to manage.
ankhaaa
she's my cat girlfriend, she's great
I had her in City Folk and was so hurt when she moved, but I was lucky when she moved in at random in New Leaf
Wolfgang definitely, and Kabuki as well as Felicity <3 I love them so much.
Its really funny though since Wolfgang was never a dreamy, I saved him from being voided purely because I wanted a tenth to avoid streetpass move ins, and now he is probably my favourite.
Well my town has most of my Dreamies, so I can NEVER let them go XD
But if Genji is going to leave (not because he's popular) I will just cry and make a town similar to the popular Marshal-haunted-infested town XP