The Last Hero by Terry Pratchett

Terry Pratchett's The Last Hero is one of those books that while it works without the illustrations, you'll be missing out a lot on Paul Kidby's fabulous Discworld art. The book follows the trail of several popular Discworld characters and this is the closest you'll get to a world-splanning crossover. There's no real villain in the story, simply lots of good guys working on opposite ends. As typical of a Discworld novel, Pratchett pokes fun at the convention of fantasy and what makes a hero a hero. Comedy aside though, the book contains depth and at the end of all this, the one thing I can promise you is that at least one character comes out of it more mature. Pratchett is a fine example that comedy and fun doesn't have to mean a story can't be meaningful or deep.