Ruy Ignis was a former Exillium student. He was banished in his fourth year at Foxfire, not long after he manifested as a Psionipath. His parents, who worked in Mysterium, turned Ruy into the Council. When Dex breaks into the Exillium records, all they say is that he was "proven unstable and unfit for society," and that his actions were irredeemable.
Ruy is a member of the Neverseen and possibly one of Sophie's kidnappers. He was thought to be the Boy Who Disappeared, but this theory is proved to be wrong when it is revealed it was actually Alvar, working for the Neverseen. Sophie encounters him when she is with Biana in the forest of Brackendale. He encases himself in a force field, while Sophie tries to read mind, which doesn't work. Ruy also thwarts all of Sophie's attempts to get him to reveal information about the Neverseen's plan.