Any of the heroes of faith. From the Old Testament to the New Testament, there are people in that book which would be amazng to meet and talk to. Imagine being able to go back and talk to Moses and see what it was like to talk to God or being in the crowd of 5,000 when Jesus broke fish and bread and fed everyone there and then had left-overs, that would be absolutely amazing. I think that I would also like to meet C.S. Lewis, J.R.R. Tolkien, and the other Inklings at "The Eagle and Child" pub and sit in on some of their Tuesday night discussions.