I love a lot of villagers, but Ursala is my girl. I almost never see anyone else mention her but I just adore her:
Her face, her hair, her freckles, her coloring, her punny name... all flawless. Plus, sisterly is my favorite personality, and I feel like the bear species is a perfect fit (as you can tell by my avie, I also love Paula and her little toof). They're tough and kind of intimidating, but also super caring and fiercely loyal to those they care about. Ursala's also lovely because her design is so versatile:
I didn't even know she existed until I got her Amiibo card, but once I got it, and moved her in to my ACNL town, I fell in love!
Honorable Mentions:
Merry (also has a perfect face and hair)
Bonbon (such a unique face, she looks so lovingly designed!)
Dobie (perfect old cranky man)
Julia (super elegant and, in my mind, some lowkey LGBT representation)
Raymond (cliched, but his design is SO cute)
Grizzly (recently moved him in but I ADORE him- he's so expressive and can be a big ol' teddy bear or totally terrifying)