Favorites are hard, I love all my villagers equally. If I had to choose, it would maybe be Marina since she's been with me the longest? Ankha and Raymond are definitely up there too though.
Old villager wise it would be Muffy - I had her back in my New Leaf town and dearly loved her. New villager wise I'd say Raymond - there's something about him I find utterly charming! Thank you for the giveaway!