There are a lot of villagers I like that simply aren't popular. But I also have some that I like that most people seem to genuinely dislike. Those include:
Marcie! She's so sweet and maternal. And I like her eyes. I also love her cute little Joey. I realize she's super feminine and could see how she might be a lot, though. I got her as a random move-in and fell in love. She was on my island for a very long time, and I'm hoping to re-add her to my restarted island eventually. Right now I'm doing a play through where I'm trying as many villagers as possible, but I know my island won't feel complete without Marcie on it. Preferably with a park next to her house for her Joey to play in.
Greta. She's consistently at the very bottom of tier lists. Greta's based on a traditional Japanese theatre mask. Kabuki and Shino are also based on theatre masks, but are much more popular than Greta. I like the idea of getting all 3 of them in a town at some point. I actually first saw Greta on a tier list. I like to look at the very bottom of tier lists, and there she was. And I thought, "actually, she's pretty cute".
Rilla. She's trying so hard to be a pretty Peppy, but she's still so ugly. I want to cheer her efforts on (and/or laugh). Plus, she's has a baboon butt. Totally see why people wouldn't like her, though. I got her in a Sanrio amiibo card pack. I only scanned her to get her furniture items, because I hated her design on the card. But once I interacted with her in-game and saw her animated I thought she was so funny, and I still think so.
Jitters. I like to think of him as the jock that's overworked himself, and has had way too many energy drinks. I think the jock dialogue is hilarious with him. I started seeing him around at dream addresses I visit every now and then. He's also another that I like better in-game than from just a picture.
Bud is really cool to me, and goes especially well with the tropical island feel of New Horizons. Honestly don't get why he's so unpopular. My husband had him as his first Jock. I sought him out at a Nook Miles Island and had him move in, even though I generally try not to have the same villagers as friends/family I couldn't resist Bud.