Fiona Goode (Jessica Lange): A Supreme Witch in the series, a mentor to some of the new witches in the series and the mother of ...
Cordelia Foxx (Sarah Paulson): Fiona's daughter and possibly a witch herself, though not confirmed yet.
Madame Delphine LaLaurie (Kathy Bates): based on a real person, LaLaurie is a socialite, serial killer and rival to Fiona. Brought to modern times in the series.
Marie Laveau (Angela Bassett): A Supreme Voodoo queen who is working with Fiona to bridge the gaps between the magic rivalries.
Spalding (Denis O'Hare): A butler at Miss Robichaux's Academy for Exceptional Young Ladies and also a mute.
Joan Ramsay (Patti Lupone): Another adversary for Fiona and also a character who has lost a husband in mysterious circumstances.
Myrtle Snow (Frances Conroy): Not much is known about this character at the moment.
Misty Day (Lily Rabe): A rumoured to be prominent character in the new series, it's also rumoured that Misty is a witch.
Zoe Benson (Taissa Farmiga): One of the main young witch characters in the school that Fiona is running. Zoe is also harbouring a dark secret secret and gets romantically involved with ...
Kyle Spencer (Evan Peters): A frat boy who develops a crush on Zoe. Has been described as a bit of a Romeo as well.
Nan (Jamie Brewer): A recurring character/witch at the school for exceptional girls and also described as enigmatic.
Madison Montgomery (Emma Roberts): Another recurring character/witch, she is also described as a party girl and teen pop star.
Queenie (Gabourey Sidibe): Another witch at the school and described as a tough girl.
Overall, not the most descriptive of character details but certainly enough to keep us going and with the exceptions of both Spalding and Kyle, this is definitely going to be the most female centred television for the next few months.
Season 3 Promo Posters: http://www.spoilertv.com/2013/09/american-horror-story-season-3-cast.html
Season 3 Title Sequence: http://www.youtube.com/watch?v=rdTU0CgOY6E
American Horror Story: Coven airs Wednesdays at 10pm on FX from October 9th and will premiere on FOX for UK viewers in the same month.