I'm fortunate to have met a lot of my personal heroes already - Malcolm Forbes, Donald Trump, Paul McCartney. I'd really like to meet Sid and Marty Krofft who were visionary producers of children's television in the early 1970's. I'm a huge fan of most of their work.
Other folks no longer with us but I would have loved to meet - CS Lewis (Chronicles of Narnia) and L Frank Baum (Oz Author.) They created some of the coolest kids books ever but ones that adults can still enjoy and get something out of.