While active on Shadow Garden missions, Omega is steadfast in her duties, executing her objectives to their fullest. When Omega is in her civilian dressing, she is seen to be friendly toward her coworkers, Kai especially as the two are partners and direct subordinates to Epsilon. Like the other girls descended from the heroes, Omega had contracted demonic possession and was discarded and abandoned by society until she was forgotten. When she found herself malnourished and alone in a dark garbage alley, as the curse progressed, she was found and rescued by the organization Shadow Garden, who cured, rescued, and recruited her. They later gave the name with which she would identify herself as: Omega. A few years later, she established a strong and direct relationship with Epsilon, one of the original 7 shadows, and together with Kai, she became Epsilon's direct subordinate and one of the strongest "Numbers" of the shadow garden-- a Named Number.