Muses. Ghosts. Cybersouls.
Muses are extremely advanced AI programs, bonded to an individual. In theory, they become an unconscious extension of the individual, a filter for the overwhelming amount of digital information accessed by an individual.
With enough use, the intelligent algorithms can extend beyond consciousness, allowing a person to never fully sleep, as their muse maintains their digital presence whilst they rest.
With an always-on muse able to continue the interests of the individual whilst they would be otherwise engaged, billionaire stockbrokers continue to get rich, engineers can maintain a watch on their nanofactories, and soldiers can maintain a greater awareness of their surroundings.
Generally, muses adopt a similar personality to their user, acting only as an extension, however in some cases they form antithetical behaviours.
Several punishments for criminals involve the deletion of their private muse, and the installation of either a fresh software iteration or one preconfigured to act as a counsellor and later as a parole officer.