Theresia Riefenstahl (テレジア・リーフェンシュタール Terejia Rīfenshutāru) the "Hraesvelgr" (フレースヴェルグ Furēsuverugu) is a human who joined The Organization to become an Eater alongside Rudi Wenders in order to take revenge upon vampires and Theodosius M. Waldstein. At least - that was what Rudi believed. In reality, Theresia had loved Theo ever since she was a child, and killed Rudi's older sister Elsa Wenders (see The Professor) out of jealousy over Theo. She became an Eater hoping that she would eventually reunite with Theo someday. At the end of Vamp! III, Theresia is subjugated by Loa.