The head knight of the Stahlritter, the knights who serve the Steel Maiden, Arianrhod.
Though her strength is comparable to that of an Enforcer's, her adoration for Arianrhod is so strong that it's sometimes hard for others to take Duvalie seriously. Because of this, the other members of the Stahlritter will often tease her.
During the civil war, she followed her lord's orders and fought against Class VII as an ally of the Noble Faction. For some reason, she felt an intense feeling of rivalry toward Laura.
A year and a half later, she takes action in Erebonia once more as part of Ouroboros' efforts to reclaim the Phantasmal Blaze Plan.