Enigma

Enigma is a very dangerous Phantom and doesn't hesitate to attack people if they attack her, so this suggests that she has a merciless personality. However, she is rather smart and instead of attacking directly, she usually comes up with plans and with her immense power, she has the advantage in most situations. At the final fight, she gave huge respect for Haruhiko. And before she dissipated into nonexistence, warmly told him: "I enjoyed the time I spent as your mother." This was probably true, as that period was probably the first time she got to experience and express genuine warmth, humanity and happiness.

Background

Engima is an "Enhanced Phantom", which means that she was created by humans; she is an artificial Phantom. The humans have been grafting human DNA to captured Phantoms. According to Engima, every nook and cranny of her body was toyed with and modified with, and she was turned into a creature unlike humans, phantoms or anything else. And because of this, she despises humans, but she claims that she doesn't do it anymore since she is "grateful" towards them now since they created her. Engima's goal was to control Phantoms and dominate humanity.