Born in a blue collar family, Kleo was named by her father after the queen of Egypt, he had encourged her to focus on studies to become a world leader but she left college after the Greek Financial Crisis and enlisted in the Hellenic Armed Forces to help out her family. It led her to join the Zeta Amphibious Raider Squadron, but then refused further promotion, mastering her ability to remain unseen and earning the name, "Green eyes of Hades." By 2022, she became a contractor for SpecGru.