In canon, Agnes is the vestal of wind, and is sort of considered a... priestess? In a way. A very important religious figure at the very least, as it's the vestals that tend to the crystals, offer their prayers to it, basically keeping the crystals from going out of control.(the Crystal Orthodoxy is more or less a religion, Agnes had acolytes/nuns who tended to the crystal with her) We know nothing about who her parents were or anything, just that she's lived in the Temple of Wind for some time, and that she and Olivia were vestalings together and that there was a 'Mother Vestal' who raised them (and 'Oblige' is the shared surname for all vestals, which is why Agnes and Olivia have the same last name).

Reading over things, it seems that the church/temple in Union is very in the background, but being a vestal is a big part of what shapes who Agnes is (and why she's so sheltered, as vestals live a secluded life in the temple, and Agnes has stated she never really left up until the wind crystal was overcome by darkness and Norrende swallowed up by the Great Chasm), and I was wondering if there's a way to work with this for her AU history? (or work around it, I guess)