The fourth villager in my town was Marina. Marina is the first villager I found on a mystery tour that I decided to keep, so she's the first one I CHOSE to live on my island, though she moved in after Peanut. Marina is great because she is an octopus and octopi are cool.
My third villager I got was Peanut. She was the second Villager I got off the Mystery Tours and the first of the three to move in after the initial tour (for some reason). Peanut is great but now that I have another peppy villager, I'm not against letting her move for space.
Second villager in my town was Boone. This man makes no sense because his name and catchphrase implies he's a baboon, but he looks like a mandrill which is not a baboon iirc. Also he has a gorilla body tail so he doesn't have a tail either.