I'm just going to quote myself form another thread here:

Quote Originally Posted by Vivi_Bushido View Post
Or maybe she's just a PLD without a shield? Ever consider that? She does use the PLD animations when she fights. The sword just simply spawned from a book, and it happens to glow. Nothing more. Even her casting animations are the same as when a PLD casts Clemency.
Sorry to be a party pooper, but yeah. She's definitely a shield less PLD.