I'd like to meet:
Hiromu Arakawa author of Fullmetal Alchemist
J.K. Rowling author of Harry Potter though I'd probably chew her out about a certain death in Deathly Hallows
C.S. Lewis...but he's dead so that will never happen I'll settle for meeting any of the cast members from the movie. I'd LOVE to meet William and Skandar.
J.R.R. Tolkien but he's dead too
Christopher Paolini
Phillip Pullman
and anyone from CLAMP the authors of such works as xxxHolic and Tsubasa