To steal a phrase from Buffy the Vampire Slayer, “The Big Bad is coming” – but this time, the vampire that will make Vlad the Impaler look like a Girl Scout is headed for Mystic Falls. For fans of “The Vampire Diaries,” the arrival of Klaus – one of the original vampires – has been long-awaited, but series executive producer Julie Plec told TV Guide that her vision of the character continues to evolve. “It’s exciting to see a lot of new faces and try to figure out who we want that character to be and what kind of attitude we want him to have, what kind of charm we want him to have,” she says. “That character is evolving even as we cast because we see a lot of things that we like and we think, ‘Ooh, that’s interesting. What an interesting take on the character.'” What’s your vision of Klaus, and who should play him?