Just take one look at my profile pic and the answer is clear~
Annalisa the anteater. It's funny because she did not start out as my favorite villager of all time. Because WW was my first AC game, that honor belonged to Jeremiah the lazy blue frog. While I still love him, NL then introduced me to Henry, another super cute frog (plus he's smug so of course he was an instant favorite!) who I adore so much, and when I decided to reset my town, one of my starting villagers was none other than Annalisa. The anteater villagers are some of my favorite species in the AC series, and her theme is Zen, which is one of my favorite aesthetics, so naturally my interest was piqued.
The more I was around her and interacted with her, the more and more she grew on me~ and when she moved away randomly one day, I was pretty bummed...that is, until I checked my mail. She had left me one last gift: her framed photo, which I immediately displayed in my living room, so that whenever I look at it I can be reminded of her. It was a precious memento of our friendship.
You can imagine my joy starting up my new island in NH and going island hopping for the very first time, I kid you not she was the first villager I stumbled upon. It was no sheer coincidence we would be reunited after all these years. It was a friendship that lasted throughout the years... She never forgot about me just as I never forgot about her

we were meant to find each other again, I firmly believe that. And ever since then she has continued to be a resident of the island of Magicant, and will forever remain so.