Pretty much all the pro bodybuilders I've met have been pretty cool - I've met the following:
Dorian Yates, Hidetada Yamagishi, Shawn Ray, Ernie Taylor, Bill Grant, Ed Corney, Rich Gaspari, Dennis Wolf, and Ronnie Coleman.
I've seen Kevin Levrone but not spoken to him cos he was talking to someone else at the time but looked very approachable. I also saw Bob Chick in the Nike Store in a shopping mall in Vegas but I didn't approach him. I probably should have.
The only two I've avoided going near are Flex Wheeler (because he was wearing shades indoors and it was obvious he couldn't give a fuck about those around him) and Lou Ferrigno (for the 20 buck thing).
I've also met Mariusz Pudzianowksi but he was moody as fuck and refused to participate when my wife asked for a photo with him.