Olaf. He is my favourite villager in the entire game, actually. The very moment I saw first him, I knew I wanted to have him in my town. I love everything about him, from his personality to his hilarious character design. And I would definitely feel heartbroken if he did ever leave my town unexpectedly. I know he isn't the most popular villager ever and I can see why some find Olaf ugly, but it doesn't stop me from loving him. ;u;
Antonio is a very close second, though. He's one of my very first villagers in the series and I don't plan to move him out ever.