Gustave Malraux (ギュスターヴ・マルロー) is a former student of Arlequint Academy.
Gustave is described to be a well shaven gentlemen in his prime.
Gustave speaks in a polite manner. He keeps his client's information secret, referring to himself as a professional.
Dante (魔術師): Mana Construction is Gustave's ability as a Dante. He creates a complicated magic circle in the air from which a mythological beast created from mana appears. Gustave's creations can operate on their own. He requires a few months to a few years to create one and each only lasts for several minutes.
- Chimera (キマイラ): Gustave summons a five foot long Chimera. It is faster than it looks and also has considerable strength.
- Orthrus (オルトロス): Gustave summons a Orthrus that is somewhat smaller than the Chimera but is stronger.
- Cerberus (ケルベロス): Gustave summons a Cerberus that is somewhat smaller than the Chimera but is stronger.
- Dra-Colchis (ドラ＝コルキス): Gustave summons a dragon that is more than one foot long.
- Hydra (ヒュドラ): Gustave summons a Hydra that is over forty feet long. It is capable of firing blasts of mana that are as strong as Saya's Lux. The Hydra can also regenerate any head other than the main one, and it can slow down the regeneration speed of certain heads to speed up a different one. According to Gustave, it took him three years to create it.
- Dragon Tooth Warrior (竜牙兵): Gustave spreads dragon fangs made of prana across the ground, creating skeletal warriors armed with swords and shields.
Genestellar (星脈世代): As a Genestellar, Gustave has enhanced physical ability and an aura known as prana.