Acheron is an Emanator of an unknown Aeon that is confirmed to have killed Duke Inferno and is believed to have also killed Robin for unknown reason. Acheron is described as cold and distant on the surface woman, embodying the traits of an intergalactic ronin and ascetic imperial maiden. However beneath this exterior, she harbors a quest for revenge, driven by reasons yet to be disclosed. She is complex and does not remember her own past. She is also tall and beautiful.