My favorite villagers are all of the ones that currently live in my town! These would be:
Pate- she's such a cute little peppy duck!! I really didn't care for her at first but now she's one of my favorite villagers, I could never part with her! She doesn't get enough credit in my opinion.
Celia- definitely a sweetheart and super adorable! She's also very underrated, I love having her in my town.
Bill- has been my favorite villager since I got New Leaf! I never had him in Wild World so I had no opinion on him, but he was one of my original 5 in New Leaf and I've had him ever since.
Papi- I love his design, and I really enjoy lazy villagers haha. I didn't know he existed for a long time but once I got him to move in he has easily become a favorite.
Kyle- love his personality as well, another villager I didn't know I wanted til he moved in.
Ketchup- peppy ducks are the best kind of villager in my opinion, she's super sassy and cute and her house is a pizzeria so I literally could not ask for more lol.
Epona- Ocarina of Time is my favorite Zelda game thus far (though I haven't played BotW yet) and I'm so happy to have her in my town!!
Jacob- Jacob is really nice and I love his house as well, even though the exterior makes me eyes hurt sometimes lol
Deirdre- Deirdre is definitely super sassy but she's the only uchi villager I like, and I'll probably never let her move out bc I adore her!
Some villagers that I don't have in my town but that I still love are:
Erik- didn't know he existed til he moved in either but I loved him instantly, he moved out without notifying me and I miss him.
Wolfgang- I'd love to have him in my town rn but he moved in right on top of my main path and in front of a bridge so he had to go, still love him though!
Medli- haven't had her yet but I'm trying my best to get her amiibo!!
Tia- had her in my town for a long time before I finally let her go, but I'll always love Tia
Molly- same as Tia, though she moved out accidentally as well