Mage

Mage (魔法使い) refers to an individual who utilizes Magic. The types, methods and quantity of magic that a Mage can use depends on the Mage's specialization, proficiency, body, and available tools.

External Magicule-based Mage
The vast majority of Mages possess none or too few of their own Magicule reserves to be able to cast any Magic. To counteract that problem, they make use of the Magicules in the surroundings and if there are too few Magicules available in the surroundings, or have already been used up, they can utilize Magic Items such as Magic Crystals, that can store Magicules, instead.

Internal Magicule-based Mage
Majins, which include both Monsters that are capable of using Magic, as well as Humans who have modified or mutated their bodies to be able to bear Magicules within themselves, usually have a large amount of internal Magicule storage that they can use to directly cast spells without needing to use the surrounding Magicules or some other Magicule storage device, making them less dependent on outside sources, though they can still use those external Magicules sources as well if necessary.

Sorcerer
Sorcerer (法術師) is the Mage Class that utilizes Element Magic. Examples for Sorcerers are Eren and Rommel.

Shaman
Shaman (呪術師) is the Mage Class that utilizes Spirit Magic. Examples for Shamans are the citizens of the Republic of Ulgreissa whose main characteristic of their culture is make contracts with Elemental Spirits.

Maya
Maya (妖術師) is the Mage Class that utilizes Illusion Magic. Examples for Maya are are Shuna and Jagi.

Enchanter
Enchanter (符術師) is the Mage Class that utilizes Engraving Magic.

Summoner
Summoner (召喚術師) is the Mage Class that utilizes Summoning Magic. An example for Summoners is Jiggis.

Elementaler
Elementaler (精霊使役者) is the Mage Class that utilizes both Spirit Magic and Summoning Magic. Examples for Elementalers are Shizu and Litus.

Holy Knight
Holy Knight (聖騎士) is the Mage Class that utilizes Holy Magic. An example for a Holy Knight is Hinata.

Magician
Magician (魔術師) is the Mage Class of those who have learned at least two different types of magic, aside from the Elementaler combination.

Wizard
Wizard (魔導師) is the Mage Class of those with a superior status who have mastered three or more different types of magic. Examples for Wizards are Jaine, Mjurran and Razen.