Jason Cosmo isn't the hero type. He's the save-your-own-hide type. So why does everyone want him dead? Especially as he's such as nice guy (his words). Could it be because the gods want him to save the world? First in the series of hilarious tales full of wizards, demons and general nasty folk who don't wash.
Terry Pratchett's Discworld series;
Robert Asprin's Myth series;
Douglas Adams' Hitchiker series