I think it would be an awesome job to eventually include after the game is at its v1.0. The beast master would be able to receive certain skills after fighting various monsters. Perhaps after killing enough of the monster, you can gain certain skills (say slaying 100 rats gives you the passive "Sneak" skill which raises your stats a bit, while slaying 1000 rats gives you the "Rat Scavenger" skill, which increases how often you find things). It also means you could tailor your beast master as you like (say you kill more chaos lords and Ogre Mages for more magic/range builds, or you kill more Lions/Cats/Dragons to become a more melee buffed build). Also, the beast master would survive better in the wilderness, but have less charisma with people (seeing as he would be considered the "Eccentric crazy guy that lives out in the wilderness" type).