While Harry Potter was unable to appear in First Among Sequels, the fifth in Jasper Fforde's fantasy series, due to copyright issues (one of Fforde's many chuckle-inducing book geek jokes), in One Of Our Thursdays Is Missing, we come to find that everyone in the Book World LOVES Harry Potter. As in, the "real person" Harry Potter, as he exists in the Book World. He's a reluctant celebrity who is quite miffed to be stuck looking like Daniel Radcliffe for the rest of his life.