A priest from the Holy Romalian Empire sent as transfer student to the Tristain Magic Academy. He has Moon Eyes, as his eyes are heterochromic—one red, one blue, like the two moons of Halkeginia. Julio is sent by Romalia's Pope as his support for Henrietta's expedition to Albion, now in political strife after the fall of the royal family followed by the death of Reconquista's leader, Cromwell.

Although not a mage, Julio is a dragon knight and expert swordsman. During his duel with Saito to win Louise's kiss, Julio could easily win against Saito—who does not use Gandalfr's skill, but he let Saito win to tease him. He has beautiful looks and a personality that grants him popularity among girls. He can be considered a replacement for Guiche after his depart to the military service because he is similar to Guiche in looks—however, Julio is worldly, as opposed to the vain, foolish Guiche, and hardly had to exert effort to charm most of the female students in the Academy.

It is also likely that his name is based from Julius Ceaser, Since Halkeginia resembles Europe and, Romalia would be Italy.

It has been confirmed in the novels that Julio is Vindálfr, the right hand of god, who has the ability to control magical creatures in the same way that Saito can wield weapons. Example includes single handedly taking on nine dragon knights of Albion and winning. Treated with some disdain by others because he's a priest. In the later novels, it is revealed that he is the familiar of the Pope of Romalia. In the novels he is also portrayed as rather manipulative. Named after Julius Caesar.