|This article is about a/an villain in Garo: Honoo no Kokuin|
Octavia is a woman serving Mendosa who knows the truth behind his witch hunt against the Makai Knights and Alchemists. She pledged her loyalty to Mendoza after losing faith in the gods and witnessing firsthand the power the "devil" wields, claiming that Mendoza's power is more substantial and thus worthy of worship and servitude. She becomes his servant under the condition that she is never to touch him. Even after Mendoza's death, Octavia continues to serve at the palace as no one is aware of her involvement with her master's plans.