Sorcerer: This magic-user was born with abilities they don't need to study, and can use more readily than other Magicians. This is sometimes explained as being descended from a magical creature, other times as being part of a Witch Species. They are often much less versatile than other magic-users, being limited to a smaller or much more tightly-themed pool of spells. Commonly, their powers manifest at adolescence.
Warlock: The Magician makes a pact with a higher spirit who supplies him with magical powers. This is usually flavoured with a Deal with the Devil. While healing class pacts are seen as good, a Magician that makes a pact with an entity that gives them the power to harm or destroy usually flavoured in a darker light — and it may turn out to be with demons.
Conjurer: A higher level in which the caster summons the entity to them to do its bidding. Usually even more dangerous than a regular Warlock.
Wizard: These casters rely on Rule Magic and study to learn and wield magic, usually taking years, leaving their bodies squishy and out of shape... most of the time.
Necromancer: Able to summon the dead.
Magic Swordsman: A magician who's able to cast a spell also able to wield a sword.