When Faith Lehane replaces Kendra Young (Bianca Lawson) in Buffy The Vampire Slayer, she is one of the strongest slayers on the TV series. Faith is the complete opposite of Buffy Summers (Sarah Michelle Gellar), who can fight demons in her sleep but is still warm, friendly, and compassionate toward others. Watching Buffy and Faith's relationship evolve throughout the show is one of the most interesting parts.