Ermite

A girl who's investigating the history of the Tower.
Her parents are alchemists, she's also enrolled in the Royal Capital's Academy as an alchemist, but she's more interested in the underground Tower than alchemy and has inveigled herself with the expeditionary team on the premises to further her study of the Tower.

Extremely curious, she will not rest until she's investigated every aspect of something which takes her fancy. This does mean she's scatter-brained and prone to mistakes. She's looking for the "Witch" rumoured to reside within the Tower for over a century.