Her appearance is based to her Tsukihime counterpart, but her hair glowing golden, her left eye turns purple and her long skirt appears to be torn up when she is with her Master.
Her personality is different from her Tsukihime counterpart when she is with her Master, as she has lost her mind and only obeys her Master's orders. When her Master disappears, she reverts back to her normal self.
Blut die Schwester
A demon said to feed on blood.
A being some claim to be of the undead and painted as evil and ungodly by those who hold to a certain religious view of the world. In addition to the need to feed on the blood of humans, creatures such as this also are seemingly immortal and are able to control lesser demons.
In a case where those who suck blood are classified among the Blood-Sucking Species, that which became the foundation for this...this is the general term for the life form pressumed to be so.
The True Ancestors are those who embody the consciousness of the planet and, in accordance with the legend, suck the blood of humans out of fun.
She is a survivor of the True Ancestors' royalty, that are the foundation of the Blood-Sucking Species...or at least it seems so. Her facet as a vampire is strong, but she is also a kind of Elemental that dwells in Earth.
It becomes easier to understand if she is regarded as the personification of a natural phenomenon, such as a typhoon or an earthquake. While rumored to be a production of the Moon Cell,after the battle she comes to her senses, tears the virtual world with her claws and simply jumps out of scene. Most likely, is the true Arcueid and not data from the Moon Cell.
A True Ancestor that had Monji Gatoh's mistaken interpretation pushed onto her.
Because she is an Elemental of the Earth, it seems that her activities inside the Moon Cell becomes an excessive stress.
Originally, her Class was not Berserker but rather Temptress.
If she was summoned under that Class, it seems that - just like
a Blood Drinker that sucks the blood of the opponent;
a Life Eater that robs physical strength;
a Finance Crisis that consumes electronic money;
- she would behave innocently and naively as an evil woman (vamp) that destroys men.
Her real Master is apparently a "normal" high school boy, or something.
This is a digression, but the fox-eared Caster gets along with her because they seem to be of the same kind, or so it has been conjectured.
Her powers are severely restricted by being summoned as a Berserker class and by having Gatou as her Master, to the point where her EX ability becomes useless.