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Yaga (ヤガ, Yaga?) is a retired instructor sorcerer who resides at the Artemis Institute.
He is also a great experienced sorcerer and part of the Coven of the Thirteen. It is known that before retiring he only instructed high-ranking sorcerers, and seems to have knowledge in all Fantasia practices such as gloves and weapons.
Yaga is a small, aged wizard who is turning 126 years old. He has a small goatee, green shaggy hair and a large sunglass that reveals small eyes that seem slanted. He also wears a traditional black wizard's peak hat that forms a star at the top with a raccoon tail at its base, a kind of black surplice, striped baggy trousers and a pointed moccasin.
He is also constantly accompanied by his cauldron which serves as an easy mean of transport since it has wheels implanted, although he also has a feather broom.
Yaga is a little grumpy and sarcastic with no bad intentions. Despite that he is also kind and observant of the people around, which makes him a very good instructor.
Yaga's new disciple. It was Alma who sent him to meet Yaga, so that he could teach to him the basic control of Fantasia in spite of his peculiarity. In the beginning, Yaga sees Seth only as clumsy boy who doesn't know how to use his power, but quickly distinguishes the problem and with training manages to gain control of his new disciple.
Yaga gives him mittens after their last training, to replace the gloves that Seth had exploded by accident, explaining that he can not manage to converge the Fantasia in his gloves but with the mittens the Fantasia will no longer be blocked from accumulating like it happened with the gloves. Thus he will better control his abilities and in the eyes of others will pass just for someone stronger than he really is, rather than getting noticed.
Alma seems to know Yaga very well as she strongly recommended Seth to train with him, to master the use of Fantasia which is his particularity.
- Despite Yaga being the only shown member of the Coven of the Thirteen, it is said that more of them resides in Artemis Institute.