Halo

Halo is a fictional superheroine published by DC Comics. She first appeared in Brave and the Bold vol. 1 #200 (July 1983), and was created by Mike W. Barr and Jim Aparo. Halo is a gestalt of a human body and an "Aurakle", an energy-being resembling a sphere of iridescent color. When sociopath Violet Harper was murdered by Syonide, an operative of the 100 and Tobias Whale, the Aurakle, who had been observing her out of curiosity, was sucked into the newly-vacant body, which it found itself animating. The shock of death-and-resurrection induced a profound amnesia in the new combined entity. As such, she was a complete innocent who was discovered by Batman who recruits her for the Outsiders. Regardless of her state of mind, Halo later has adventures in which she had to deal with the consequences of her body's previous occupant's actions, which required the assistance of the team to resolve. In one incident, early in her existence, Halo accesses the memories of the long lived Aurakle... full article at wikipedia