Gail Whitehurst was just an ordinary teenage thief in a small wizardy town until he stole valuable possessions from a local shopkeeper and is forced to work with the shopkeeper in exchange of him staying out of jail. At first, the work of being the shopkeeper's apprentice is a bit hard for Gail, but then he slowly starts to see the potential of being a magic user and he starts to see another side of his master.
This is the pinterest of the characters: http://www.pinterest.com/agrippas/magic/