I don't think I can rank them so I'll do a general list!
-Agent S (I know, huge surprise) - she was one of my first 10 villagers and her house is right behind mine so they're landscaped in one cohesive block. She's always the one who throws my birthday parties and all, I just feel like we're best friends.

She gives me the best nicknames too. I want to be shmoopy forever, haha.
-Tia - Also one of my very first villagers who moved out because I didn't really understand what time traveling did early on.

I really hope I can get her back someday, I always felt like she was kind of my mentor.
-Canberra - When she came to my campsite and I saw those enraged eyebrows I absolutely had to have her move in. I love the uchi personality and with that face I feel like she is the ultimate uchi villager.
-Peck & Goose - maybe cheating to put them together but I always imagine that they're best friends and greatest rivals, racing around knocking over my other villagers while they try and prove who's fastest and strongest.
-Ankha - She was the villager I got to fill the Tia-shaped hole in my heart, haha. She's so cool and stylish, I feel like she helps offset the jockiness of my town so well.