Delta 4, or Lady Delta as she is called on Edenoi, is a fully sentient, multifunctional automaton created by Queen Thalassia of Edenoi. The fourth and final robot in the Omega series, she was created to be Alpha 5's helpmate and love interest, using the same types of metals, circuitry, and design. Her head and overall body design is the same as Alpha's with minor differences, such as a "skirt", "breasts" and curves.