Aquila

Aquila was born from an elf mother and a archdemon father. Aquila had a twin sister named Camilla. In the final war between humans and demons, her father removes his life token (a sign of great-demons) and sacrifices himself to help Aquila. Aquila then lead the army against purebred demons with an alliance of humans and mixed-blooded demons like herself. Camilla ends up betraying her sister and signs a contract with the other purebred demons but Aquila eventually defeats her. After being successful in the demon war she was hailed as the goddess of victory by humans. Demons nicknamed her slayer and feared her because of her achievement in the war.