The first duck villager I ever had in one of my towns was Quillson. I didn't like his design and wanted him out to make room for dream villagers from pretty much the moment I met him.
I have since had Drake, Gloria, Maelle, and Molly.
I got rid of Drake pretty fast, though I do like his design. He just didn't fit into any of the themes I had going on.
I liked Molly, but I liked other villagers better, so like Drake she got the boot.
I still have Gloria and Maelle. Gloria is a permanent resident of my all-bird town, and Maelle was a starting villager in the final town I decided to make. I plan to get her out to make room for someone else.
Mine was Deena I think, I didn't really care much for her unfortunately so I didn't mind when she left. She still lurks around Main Street though so I can never truly get rid of her...
Man, that's going quite back. Haven't had a duck in ages. I'll try to remember.
Second GCN town: Weber (or Freckles, I'm not so sure who was first but they both moved out),
e+ town: Bill (Nye the Science Guy, he moved in a while ago),
New Leaf town: Derwin (before I resetted my town on the 21st September 2016).