Dr. Lemuri Charmlotte is a Mage and current Guild Master of the Dark Guild Franken Bolt. She is also the Guild's inventor, even building the "Guild Hall" Valefor--a fully battle ready airship.
"If you evoke the attention of the doctor, be aware, for now the abyss will be staring into you and the good doctor will do everything in her power to make you her next 'project'."
— Shion Albedo
Exiled from a previous laboratory she worked at for delving into human experimentation. Scolded by her colleagues, she continued her experiments and eventually mastered the art of binding two different species together with Lucia and herself being the only known experimentees.