As far as actors go, probably Heath Ledger...
Garcia would have redied a few times by now have he been brought back in 95...im a fan but I'm not sure he was really digging life so I'm glad he was able to check out. Not sure anyone could begin to picture the condition Garcia would be in 20 years later because the wheels were coming off pretty hard back then..
my vote is for Andy Kaufman...super genius when it comes to mind fucking and I'm pretty sure with technology and media the way it is now he could be having a field day