None of them. They are all too socially astute.
I suppose an awkward, bookish type of character could fit into the show just fine, though. That would be nice.
League_Girl--it's a pretty typical trend of the sort you see in NT society all the time. This one makes some kind of sense, though, because the show is well-made and entertaining even if you aren't a little kid. Its popularity was probably due initially to its quality, but after that just due to the snowball effect.
I've seen a couple of episodes, and if it weren't for my general dislike of sitting still long enough to watch a TV show, I would probably be a casual fan. I'm one of those adults who refuses to leave behind "kid" things. Especially, in my case, kids' books. Some of the best books ever were written for kids. Chronicles of Narnia, anyone?