Ireena Kolyana was once a kind-hearted human rescued and adopted by the Burgomaster of Whitestone. But after the failure of those sworn to protect her, she was delivered into the hands of Strahd von Zarovich—who shaped her into his final bride. Now a chaotic evil undead shapeshifter, Ireena stalks the world as a creature of hunger, vengeance, and corrupted longing. Whatever humanity she once had is twisted beyond recognition, and her name is spoken in fear wherever the mists stretch.

(I count her as OC, because she is so different from the normal Ireena. My party failed the encounter with the hags, and got Ireena kidnapped...or rather they ditched her with the hags.)