Ophelia is the "child" of steampunk Grayclay, her body is made of titanium, molybdenum and nickel... allowing to resist rust, extreme temperatures (hot as cold) and be light for a robot.
She lives with her ​​father and Bayne in the zeppelin above the city they protect. Yui having served as a model for her creation, she can be considered like his "mother". Ophelia does not obey to the robotic's rules, his father having given her Feelings and the 5 senses, she has same requirements as Organics.