Rincewind the Wizard is a fictional character appearing in the Discworld novels of Terry Pratchett, several of which feature him as the central character.
A failed student at the Unseen University for wizards in Ankh-Morpork, he is often described by scholars as "the magical equivalent to the number zero", and spends just about all of his time running away from various bands of people who want to kill him for various reasons. The fact that he's still alive and running is explained in that although he was born with a wizard's spirit, he has the body of a long-distance sprinter. Rincewind is also reputed for being able to solve minor problems by turning them into major disasters. His unique "skill" is implied to be due to being the chosen one of "The Lady", the anthropomorphic personification of luck.
In Rincewind's debut in The Colour of Magic, he acts as a guide for the tourist Twoflower, who hails from the Counterweight Continent, a continent across the disc from the 'hub' continent where Ankh-Morpork is situated. He is recruited for this job because he is the only one who can communicate with Twoflower (they use Be-Trobi as a lingua franca). He and Twoflower wander around for quite a while, and get chased by everything from the personification of Death to a Lovecraftian creature named Bel-Shamharoth.
Even after Rincewind and Twoflower part ways at the end of The Light Fantastic - with Twoflower giving Rincewind his sapient-pearwood Luggage in the process - Rincewind's adventures continue to see him being chased across various regions of the Discworld in spite of, or often driven by, his desire to find somewhere where he can relish boredom in peace and quiet.
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Official Site: Terry Pratchett
Links: Wiki on Rincewind Discworld wiki on Rincewind Bio of Rincewind