Any character can learn the skill, if they meet the requirements. The presets available at character creation give you a way to start with stats, skills and talents (hopefully) appropriate to the type of character you want to play, but do not put any restrictions on how you build your character. A pure warrior probably isn't going to learning many mage spells (which also have Intelligence requirements), but you could certainly build to a battle mage character if you wish, or start with another preset and then focus more on warrior aspects.
