Faith is a Slayer: a girl endowed with supernatural abilities and destined to battle evil creatures such as vampires and demons. Created as a foil to the protagonist, Buffy Summers, she is a Slayer who comes from a damaged background and often makes the wrong decision. Initially an ally to the main characters, events take a toll on Faith's sanity and she slips into a villainous role. Later storylines show her feeling remorse for her past crimes, and with the benevolent vampire Angel's help she eventually rejoins the side of good in the hopes of achieving redemption.