Robin Williams found dead in his Bay Area Home...

[Napoléon]

I'm not sure there is such a thing as "true personality." Most people who suffer from depression have two related personalities

That's pretty much exactly what I was getting at, you're just wording it in a different way.

My meaning of 'true personality' is one which he simply doesn't express in public. His private personality if you will. He undoubtedly seemed to act strange in many of the interviews I'd seen of him, almost like he was nervous and not really good with people. Like I said, he seemed to try too hard to be the funny man, maybe because he was self conscious or thought he had to be funny constantly. I'm only speculating, none of us are professional psychologists and really know for sure what's going on in his head.