For both towns, a ranking from favorite to least favorite
Ophylix:
Felicity - She's not the most popular of cats but I think she's wonderfully adorable. :3 Even if she has tried to leave me 7 times since April. I picked her up for free from TBT actually. She was the very first trade I did on this site.
Pango - She's been in my town from the beginning and she's been my mayor's best friend from the early days of my town
Lionel/Beardo - I got them for the same reason. Mustache. I love both of them to death. Lionel is my gay best friend and Beardo is my husband.
Caroline - At first I picked her up on a whim just to fill a spot cause I saw her for free on reddit. She was the very first island villager I had on the gamecube version and I remember thinking back then that she was really cute and I wanted her in my town so I visited the island pretty often. After a while in my town I realized that I really liked her and she's become a permanent addition because I can't imagine my town without her.
Rosie - I lucked into her one day cause I was debating on not getting her so I wouldn't have a cat overload, but my sister found her cheap (for Rosie anyway) and so I bought her.

She's adorable.
Ankha - From the moment I saw her design I thought she was really cool looking. I wanted her a lot for my town and one day we found an auction for her. We paid a lot (20million) for her but I really enjoy having her in my town. I've even built her a sphinx close to her house so she'll be at home.
Muffy - I decided on Muffy after Mira left me. I needed an uchi and Muffy stood out to me. She's kind of secluded herself in one part of town, but I'm hoping to have Maple join her soon. For now though she really is the black sheep. XD
All other NPCs
Freckles - DIE IN A FIRE!!! *ahem* I picked her up accidentally off streetpass. Her house is right in front of mine. I really just want her to leave.
TheUnder:
Julian - I try not to get too attached to my cycling villagers cause I'm giving them all away but I love smugs and Julian often professes his love to my mayor and calls her mon amie. He even celebrated that mayor's birthday at Whitney's.
Fauna - I picked her up out of a tent recently and I must say she's really adorable. She's going to my cousin cause she's a super dreamie of hers and she didn't want to pay a lot of money for her. She's adorable and I'll enjoy her while I have her.
Molly - I had her on my main town as well and gave her to my sister who wanted her. (picked her up out of a tent) She appeared one day while I was tent resetting and so I picked her up again to give out to someone else. She's super adorable though. <3
Blaire - I picked her up out of the tent totally on a whim cause I thought she was cute and I hadn't seen her much. She's not super popular, but I like her and I hope I can find her a good home.
Mitzi - Got her out of a tent as well. (I tent reset every time someone moves) She's nice and spunky and I think I've had her in a past game.
Ruby - Picked her up out of the tent cause someone was interested in her. I don't usually do reservations but someone was really hoping to get her in my thread so I'm going to make sure they can get her.
Whitney - She was a starter of this town and is the only remaining starter. She's kind of my mayor's best friend. She was the one who came and got me on my birthday and threw me a party at her house. She's alright I just don't understand why she's so incredibly popular (maybe I'm just a cat person)
Fang - I got him out of the tent cause he's popular. Much like Whitney I don't see his appeal.
*Nana - I'm holding her for someone, but she's cute. She's not one I'm cycling so I don't want to rate her.