I am curious if there's a word for a person who apparently fits in easily but still remains different from the others—he thinks differently from the mass, or has different interests and who, maybe, is a little above the others, in intelligence. He is not an introvert, but still has a loner feel to him.
I think I need something between "wallflower" and "social butterfly". And it should be a noun.
Is there a word, an idiom or a phrase for something like this?