I am kinda in the process of creating a nightmare before Christmas theme town and Stitches has been one of my main dreamies for it. I think he just reminds me of Sally. Coco goes great as well! She's one of my favorite villagers.
Coco and Tabby are both really good; when I think of Sally the first villager that comes to mind is Stitches but on the other hand....he's so adorable. Maybe Cobb to represent the mad scientist? Not as cute as Coco, but its a pretty close reference (plus its always a nightmare when he shows up in one of my towns )