7. Juquia was recruited by Marisbury personally. Originally to serve as sort of Energy Source if there should be some major Blackout in Chaldea. But she is meant for emergencies and as ace in sleeve. That’s also why she isn’t registered as a Master in Chaldea.

8. Lady Juquia and her Servants both work undercover as Chaldea Staff Member, using a Mystic Code that is hiding the Heroic Spirits true identity. This is also so the enemy won’t focus on Juquia and she can fulfill her role. If you want to be her Servant you have to be accept being regular staff.