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Faith Lehane, 'Buffy the Vampire Slayer'
When Buffy is killed (albeit briefly) by the Master, Kendra is called as the new Slayer. When Kendra is killed by Drusilla, Faith steps up to the plate. But she's no Buffy. She's reckless, impulsive and way too into her Slayer duties, ultimately going to the dark side for awhile before returning to the forces of good.