Celeste

Celeste, real name Morgana le Fay (モーガナ ル フェー ), is an Elf that abadoned her kingdom many decades ago and delved into the Dark Side of morality, becoming an affiliate of the demon guild Tartaros. She is currently in disguise as "Celeste" and tricked Prince Xenon into fleeing by framing him for murder, so that the King would act rationally to bring him home; leaving all the other Kingdoms defenceless for Tartaros to exploit, something unknown to anyone, bar Tartaros, and a small band of people assigned to bring her into custody.

Magic and Abilities
Amaterasu

Immense Magical Power

Trivia

 * Celeste is based on Caster from the Fate/Stay Night Unlimited Blade Works series.