red_arcueid
A hypothetical demented version of Arcueid Brunestud, succumbing to her blood lust.
In the original Tsukihime, she only differed from the original Arcueid by having red sclera and yellow eyes. In the remake, her outfit differs by being the one from the original game but with side slit on her purple skirt.
Also known as Warcueid (which comes from waru- (bad) + Arcueid, in the same line as Wario, Waluigi, etc...) or Bousou Arcueid.