Proxy of Moonlight; Creator and Supervisor of Charos Dome. Takes the shape of a female. Has feeler-like strips that extend from its head; these are used as its primary means of attack via skewering. Senex was implied to have had a romantic relationship with Kazkis Proxy. She would be defeated by Ergo Proxy, and later avenged by Kazkis Proxy, though his attack resulted in his own death. It is implied that Kazkis and Senex reunited in spirits after their deaths.
Female in appearance, Senex wears a mask with a large red eye on it. The large red eye also appears on her garments and on her shoulders.Senex without her mask -->