ヨアン

In spite of his youthful appearance, Ioan is remarkably intelligent, working as an apprentice librarian of the great wizard Northbrook, and often found fervently studying in the company of his familiars. He is very shy and easily flustered, with a gentle and peaceful nature: even something as small as injured mice or withered plants deeply upsets him.

His gem is located on the nape of his neck.

He is later revealed to be the same person as Northbrook, and the engineer behind the robots.