-Archetype：Earth is Arcueid's true form, which shows her side as the touch of the planet as the True Ancestor of highest grade of purity. In order to become this form she must take back her stolen hair from Altrouge Brunestud. She is referred to as the guiding principle "Crimson Moon" however she is not a different personality, her principle of conduct is different but her essence is the same as that of Arcueid. She is the "shadow of Arcueid Brunestud", a possibility that may eventually accept the Crimson Moon's will.
-Her sense of morality is different from a person's. She enjoys ruling over things she can control and does what she likes without consideration for whether they're "good" or "bad". She sees human culture as pathetic and talks down to people as a queen would, but does not dislike humanity. On at least one occasion, she's thought of melting the polar ice caps and wrecking continents because she could, even though this would kill the few people she's grown to love and care for like Shiki Tohno. But she's also capable of genuine affection and compassion, like how she commends Riesbyfe Stridberg after her failed attempt at avenging Dust of Osiris in her scenario. She wouldn't even mind if Shiki fell in love with someone else so long as he's happy and unharmed, unless that someone else is Ciel.