Aquaria Eschenburg

She is a robot built by Augusto Eschenburg to perform at his opera house. Although she was built perfectly, she lacked the one thing humans could not give to her, a soul. Augusto killed himself in the basement of the opera house while it was still under construction to give his soul to her. However, this was something that could only be done by High-Class vampires, so for awhile his soul wandered aimlessly through the opera house. At some point Fidelio came along and helped him by passing the soul on to Aquaria. Since then she has become his servant. Through her soul which has become one with the opera house, she can control it as she wishes.