Vampire is a character in My Immortal. He is a goth version of Harry Potter. He is also a vampire for some reason. The author ostensibly decided to cut right to the chase with that name choice.
Vampire dated Draco at some point in this fanfic universe. The fact that it happened before Ebony even entered Draco's life at all was irrelevant to her.
Vampire enjoys the taste of human blood and can frequently be heard giggling about this fact.