Stories of Vampires were popular long before Twilight made these magnificent beasts sparkle, and they still continue to be a great source of inspiration for many supernatural Anime — thankfully, minus the bling factor.
The most generally accepted vampire mythology claims that these creatures were once human but, through a transformation initiated through blood exchange (and consumption), become undead beings with superhuman abilities. However, vampires are no longer only portrayed as evil, with many Anime series putting their own unique twist on traditional vampire tropes, with epic results.
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There are two types of vampires in the Hellsing vampire lore, namely Purebloods and artificial vampires — laboratory creations made by the Nazi aligned Millennium Organization. As the story goes, the only humans that can transform into vampires are virgins, who have to be drained of all blood by a vampire of the opposite sex. If said human's virginity was, in fact, not intact, they would ultimately become a zombie-hybrid known as a ghoul. Before Seras Victoria had undergone the transformation, she worked in the police force, forming part of the team sent to investigate a rogue priest from Cheddar Village.
The holy man was actually an undercover vampire set on building an army of ghouls, starting with the Village's residents. The devious priest manages to take Seras hostage, intending on adding her to his ghoul army — until the great pureblood Alucard appears. After confessing her celibacy, Seras is severely wounded by the priest (who has no use for virgins) — but she is granted a second lease on life after Alucard offers to turn her into a vampire. Already possessing a
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