My starters are: Derwin, Vladimir, Twiggy, Broffina(Moving in a few days), and Mac. I just recently started my town so almost all of my starter villagers are still there. They aren't my favorite animals though, so I'll probably let all of them move when the time comes. The only starter villager that I may keep longer is Mac, just because he is a sweetheart and I adore how he looks.
I decided back on day one to keep my original 5, and so far, I've been successful. That ultimately has been forcing me to play this friggen thing everyday, but whatever. The original 5 are: Skye, Rooney, Antonio, Maelle, and Papi. It's easy to prove too, sit under my tree in my town, and those 5 residents don't have move in days!
All of my starter animals and moved in ones are tier 5's that I don't like at all, the only decent villager I have is Poncho and I don't plan to keep him.