Pudge. He was in my first acnl town from the start and even though most people don't find him very cute or anything I grew pretty attached to him haha.
Oh there are TONS of cute Tier 5 villagers. I can't even list all the ones I think are adorable. But of the ones that have lived in my town, my favorite was Agnes. She's so cute and has a cute voice and she's kind of cross-eyed, which makes her even more adorable to me. I loved her, but had to let her go because she was in the way of a bridge I needed to build. :'c
But as I said, a lot of them don't belong at the bottom of the barrel. They just ended up there because life isn't fair, and even IRL some very cool people somehow don't end up on the popular list. It's a mystery. And the moral of the story is that popularity is arbitrary and doesn't prove anything about someone's character.