Aurora

Aurora, also known as the Demon Diabolos, is a mysterious person from the distant past, regarded as the "Witch of Calamity" who plunged the world into chaos until she was sealed away by the Hero Olivier. In the present, the eponymous "Cult of Diablos" seems to be trying to harness her power for their own ends.

Appearance
Aurora has black hair, violet eyes, and she seems to have a mole under the right side of her mouth.

Personality
Not much is known about her past or motives, due to Aurora's amnesia. She is playful, humorous, and seems to be fond of Cid Kagenou.

Chronology
Nothing is known about Aurora's past except that she was a war orphan. Very few members among the church know of her story. She first appears as a memory when Shadow is forced to participate in the goddess trial at Lindwurm. Shadow defeats Aurora and uses the ensuing chaos to flee the premises. Later, Cid Kagenou is surprised when a magical door crosses his path and stops him from going further. Cid opens the door and finds Aurora chained. He reluctantly saves Aurora who admits that she has been imprisoned for over a millennia. The two work together to escape the prison, which is actually a labyrinth of memories. They are assailed by Zenon Griphi and the memory of Olivier, but Cid defeats them and destroys the core of the prison, which is actually Diabolos's hand. The prison is destroyed and Cid has a conversation with Aurora. Aurora tells him that she will cease to exist, but doesn't regret it at all. She also reveals that she was the one who summoned Cid and is glad to have met him. Before disappearing, Aurora tells Cid that if he ever finds the real her, he should kill her. Unknown to Cid, Aurora is the true identity of the great demon Diabolos.

Powers & Abilities
While her full power remains unknown, Aurora is arguably the second-strongest character in the series after the Shadow. Even her projection was so powerful that Nelson believed that it could easily defeat the Shadow, and the Shadow himself noted that it paled in comparison to the real deal. When possessing Claire, though unable to bring out her full power, Aurora was able to considerably damage Elisabeth, something no one before that had even been capable of.

Her fighting style appears to revolve around summoning and telepathically manipulating several different weapons. Also, despite having been imprisoned for so long, her projection was capable of manifesting a magical door to summon the Shadow to her side. Aside from this, she can read magic runes.

Trivia

 * The name Aurora means "dawn" in Latin.