Minagawa Junko (Japanese), Aaron Dismuke (English)
Born in 3045 AD, the Earl of Memphis and the Empress's Swords Keeper, Ion Fortuna is very young by Methuselah standards. The grandson of Mirka Fortuna, he is full of pride for both the Empire and his race, and is quite nimble and strong for his age. He is ordered by the Empress to act as an Imperial messenger and envoy to negotiate with the Vatican. Upon his arrival at the Vatican embassy of Carthage where Caterina was staying, the building caught fire, causing the Vatican's agents to believe that he was involved. He fled from Father Tres' gunfire, but was injured by a silver bullet. Abel and Esther established contact with Ion and Radu, and aided their escape through the underground passages beneath the city.
After learning Radu has betrayed him to the Rosenkreuz Orden, Ion is terribly saddened, but finds comfort in Esther's friendship. Initially, Ion holds strong prejudices against Terrans, but after his acquaintance and growing familiarity with Esther, his attitude changes considerably, from the once selfish and human-loathing character seen when he first shows up at the Vatican. Proved when the Puppet Master tries to control him, Ion attempts to commit suicide in order to stop himself from unwillingly killing Esther in a bloodthirsty rage, but is thwarted and saved from this fate by Father Nightroad. Ion seems to fall in love with her, though he does not tell her how he feels. Through his experiences with the treachery of the Order, Ion develops a growing desire for vengeance, and eventually joins Abel in his quest to destroy them..