The She-Devil is end result of an attempt to create a stronger, faster, and more intelligent version of the Rainbow Devil Mechaniloid products created during the Elf Wars. She had once fought against Zero but unsurprisingly was defeated, despite putting up a rather difficult fight that strained Zero's maneuvering skills. Though she survived the encounter, she was left in a comatose state until Rhapsody found her and reactivated her. However, she was quite different from before, without any recollection of what happened prior. Initially a mindless machine relentlessly attacking enemies without discrimination, one too many hits to the crystal by the Z-Saber has turned her character from a cold-blooded killing machine to something a little more friendlier.