A feral, violent girl with long fangs and the eyes of a beast. A witch's curse can be seen in the form of a rose tattoo on her collarbones. Guideau currently works for the Order of Magical Resonance, a group that works by magic, for magic and of magic. Her partner is Ashaf.

Spoiler

Guideau's true form is locked inside Ashaf's coffin. She is originally a man who's extremely powerful, considered to be a witch's "one true natural enemy". Her current appearance is the result of a witch's curse.