Harper Lee. She is the author of "To Kill A Mockingbird", which is, in my opinion, the greatest book ever written.
C.S. Lewis. yes, i know that he wrote many influential books on Christianity and the likes, but I find those rather boring. However, "Chronicles of Narnia" is a masterpiece, no matter how old I get. And since we're on the subject of kids' books, I really enjoyed all the Harry Potter books as well...but I have no interest whatsoever in meeting J.K. Rowling
Smith Wigglesworth would be another amazing person to meet. The amount of faith in Jesus that man had is amazing.
Harry Potter books (all of them)
Calvin and Hobbes
Get Fuzzy
Steve Carrell. funny fellow
Johnny Cash. He was really rough around the edges, but in his later years, he had a very close relationship with Christ, and he was not at all afraid to speak up about it. I think he's a perfect display of a true Christian who struggles but has such a strong faith in God that no matter what he realizes that he can always crawl back.
Probably a Chupacabra would be exciting to meet as well, but i might not live to tell the story