Caerula Sanguis (カエルラ・サングウィス, Kaerura Sanguwisu?) (Latin for "blue blood") is the last surviving Type-V mutant, a human who was infected by a retrovirus known as the V-virus and gained vampire-like characteristics such as eternal youth. She was originally born as Vilma Fachiri (ヴィルマ・ファキーリ, Vu~iruma Fakīri?) and adopted several aliases during her long life.