Actually, for some reason, I kept getting popular villagers in my town before I knew that they were popular (I got the game for my 12th birthday, so I didn't really get into the ACNL community until later). I ended up especially loving Marshal, Skye, Kid Cat, Stitches, Bob, and Colton. They all seemed to have so much personality and I loved talking to them and doing their chores (heck, while they were all in my town at the same time, I got the silver Samaritan badge with under 100 hours of play time). I don't have Marshal, Skye, Kid Cat, or Colton anymore (Marshal and Kid Cat got voided--all my friends/sisters had full towns or had Marshal already ;n; ), and I miss them so much--I cannot stand not having them there anymore. I've fully cycled out Kid Cat and Marshal intentionally, even letting Rosie and Fauna go. I reallyreallyreally want those two back, and fast.
Actually, I was going to get Marshal back, but I then realized that Colton had set up a plot in my town and left my town full. I hated him for that at first, but I then realized the error of my ways and ended up loving him. He moved a week later. ;-; He's currently in my friend's town, and she's completely obsessed with him.
I do feel the same way about many other villagers, like Big Top, Mira, Benjamin, Caroline, Wendy, Lucha, and Pietro (though I think he's pretty popular, actually). My favorite villager happens to be Butch, but no one else I know seems to have him, which is really sad. He's freaking awesome.
I feel like most gravitate towards villagers with cuter/cooler designs and the like, which is perfectly fine with me as long as the "ugly" ones are not hated on. Most people possibly are so enamored with the so-called top ten because they're the most well-known for being cute. This may not be the case, though--it's just a guess.