Less 'missed out on' and more 'deliberately passed up while reseting'. Some of the more popular ones I've let go are: Bob, Flora, Lily, Marshal, Maple, Merengue, Octavian...
I think you need to improve the place for campers because the camping place should have some wildlife, nature's greenery and also a lake for swimming these are the things which attracts the camper to visit the place again and again.
A friend of mine had Julian in her campsite, and only had 8 villagers, but she gave up after a couple times (Not knowing much about getting them to move in.) And then "accidently" tt'd to the next day xD
I don't tend to look in the campsite, i had Kabuki and had space, but didn't get him xD
If she'd have TTd back a day he would have still been there :/