Backstory: The Moebius counterpart of Emily, Anti-Onyx is more robot than Möbian. She was made in Miles' lab to be a girlfriend and slave to him, but couldn't build her past the height of a five-year-old rabbit child.
Anti-Onyx is very robotic, she doesn't feel joy like Emily does nor does she understand the concept of fear like her. She doesn't eat, survives off nuclear power and has no concept of what's right or wrong. Anti-Onyx lives to serve her master and whoever holds her remote control.