|Other names||Doctor (by Numbers)|
|Species||Human (Artificial Mage)|
|Family||Uno, Due, Tre, Quattro (genetically)|
|Japanese name||ジェイル・スカリエッティ |
|Voiced by||Ken Narita|
Jail is probably named after Ferrari 612 Scaglietti, produced by Carrozzeria Scaglietti, an Italian car design company that also designed the Ferrari Testarossa (which, in turn, may be referenced by Jail's participation in the creation of Fate Testarossa).
Jail bears a great resemblance to Ingram Prisken of Super Robot Wars. Like Jail, Ingram was responsible for the development of advanced weapons technology, created a female clone of himself as an assistant, briefly brainwashed two supporting heroines (one blonde and one blue-haired) into fighting for him, and eventually betrayed his creators.
In the Sound Stages, Jail Scaglietti is revealed to be an Artificial Mage, the end result of the top-secret Unlimited Desire project conducted by the TSAB High Council. The project's goal was to obtain Lost Logia-grade weapons and magic for TSAB by creating a genius intellect wholeheartedly devoted to discovering and researching the long-lost secrets of Ancient Belka and Al-Hazard. The project was a complete success but the Council was ill-prepared for it, as Scaglietti soon went rogue using his vast expertise in ancient technology. Although pursuing his own agenda, he coerced the TSAB leadership to cooperate with him and to cover up his illegal activities, simultaneously threatening them and promising them the boons he was originally intended to deliver to them. One of such cover-ups was the Combat Cyborg Incident.
In the beginning, Jail seems to only be sending his Anti-Magic Drones after the Relics, but it soon is revealed that he is also using Lutecia Alpine summoning magic by promising to revive her mother if she helps. Jail developed the Numbers which are named after numbers in Italian, as the name suggests, and has sent them to do his bidding as well. Jail's main ambition is to control the world by implanting a Relic inside Vivio Takamachi, which would allow him to use her to control the Saint's Cradle, and put her in Saint King mode for combat. Jail planted his DNA inside all of the Numbers, and when he was defeated they were to recreate him, but that plan failed when the Numbers either changed sides or were put in a position where that was impossible.
In Sound Stage XEdit
Jail Scaglietti appears briefly in Sound Stage X. He is still kept at the Gruen (グリューエン Guryūen) high security orbital prison over the Uninhabited World #9. In return for his expertise in Ancient Belkan history, Scaglietti asks for red wine to properly commemorate Due's death, demonstrating that he does care about his Numbers, as opposed to just seeing them as tools, which possibly explains why four of them chose to remain with him when offered a pardon.