Cadence

Cadence is an alternate version of Constance Lim who lives in the Vault of the Key Zone.

Background
Cadence, in actuality, is a corrupted file in Constance's past memories that were considered erroneous. Technically speaking, she is a Fabricate version of Constance, meaning that she possesses a negative polarity.

Both Cadence and Constance have the ability to switch places with each other. This is achieved when both are present and have the exact same magnetism at the same time. It is used when Constance was kept in captivity for purification and was needed to continue with the mission. Austin let Pandora into the Vault where she met with Candence, and while comforting her, she and Constance switched places.

Other Information
Cadence is seen to wield a remote control which consists of a power, stop, play, reverse, recall, menu, arrows and channel buttons. It was used to torment Constance with past memories. Constance has also used this remote and is in possession of it, as they are essentially the same person.