Known for their indigo auras.
They're critical of everything, but that also includes themselves. So don't mistake them for being stuck up or snobby all the time... They are antisocial but very empathetic, and sensitive, and can see people's true intentions better than most.
Just because somebody is a better listener than a speaker, it doesn't mean they don't approve of you.
Boy: That kid's stuck up and weird...
Girl: Nope, he's just an indigo child.