Buffy the Vampire Slayer
Faith Lehane (played by Eliza Dushku) was a vampire slayer. Buffy's first death caused Kendra Young to be chosen as the Slayer. When Kendra died, Faith was chosen. Faith is in many ways the opposite of Buffy. While Buffy had family and friends for support, Faith was alone. Faith tried to fight evil, but later chose to be evil instead. In the end, Faith learns from her mistakes and helps Buffy in her fight.