Not surprised by the fact that there is no clear personality to artists. You need look no further then the varied work of artists. Just look at the different styles on
http://www.portraitartist.com/. And this is just comparing portrait artists. Imagine if you included all people who choose the title of Artist. There is no way a singular personality type could have produced such varied styles of self-expression.
I think it is non-artists that try to lump us all in one basket.