None. Celebrities mean nothing to me.
Pretty much how I feel too. I never got the obsession with celebs. To me, they are people with jobs, and are doing their jobs. An actor or other celeb does not mean more to me than a construction worker or bus driver or any other job. They all have a job to do, and do it, and get paid for it. Not to bring down celebrities, it's just how I see it. Why do we glorify them so much? Heck I kinda wonder if they feel the same way themselves. Constantly having people stalking you or wanting your autograph or flipping out when they see you probably gets old after a while. Or celebrity news talking about every little aspect of your life. I can't help but laugh when the news goes on for hours about what some celebrity said on twitter. Who freaking cares!
That said, if I had to pick one I think I'd go with Robin Williams, mostly because of how he died. Depression is a terrible thing, and it's really sad when people feel the only way is to take their own life. After going through depression myself recently I totally understand where they are at though and why they eventually off themselves but it's still really sad that they felt it was the only way. I seeked help and thankfully everything I did to fight it worked and I'm recovered but I imagine for a lot of people it's not as easy, especially those who have clinical depression. That or general anxiety disorder, or other similar mental health issues are horrible to live with.