Big Bad

Big Bad is a term applied to describe the major villains on American Horror Story.

The Big Bad is typically the biggest villain of the season, taking up much of the protagonist's time and having an evil scheme that dominates throughout the season. Occasionally, the show will introduce a character who acts as the Big Bad (i.e. Twisty), only for them to be taken out for a new antagonist to enter the fold.

Additionally, there will usually be a "Little Bad", a secondary enemy who runs through a separate or lesser plotline, though also may act as a henchman or accomplice to the Big Bad.

Murder House

 * Big Bad
 * Tate Langdon
 * Little Bad
 * Hayden McClaine
 * Constance Langdon
 * Moira O'Hara

Asylum

 * Big Bad
 * Sister Mary Eunice McKee/The Devil
 * Bloodyface
 * Little Bad
 * Dr. Arthur Arden

Coven

 * Big Bad
 * Fiona Goode
 * Marie Laveau
 * Madison Montgomery (ultimately)
 * Little Bad
 * Hank Foxx

Freak Show

 * Big Bad
 * Dandy Mott
 * Stanley
 * Twisty (initially)
 * Little Bad
 * Maggie Esmerelda

Hotel

 * Big Bad
 * The Countess
 * Little Bad
 * James Patrick March
 * John Lowe

Roanoke

 * Big Bad
 * The Butcher
 * Scáthach
 * Little Bad
 * The Ghosts