Lorelei Freyadottir, sister of Amora
Lorelei Freyadottir is a minor antagonist in the Kingdom Hearts Unlimited Saga, only appearing in "A Year of Misery" as one of several bosses faced in the SHIELD/Cybertek campaigns.
The younger sister of Enchantress Amora, Lorelei was always jealous of her older sister for having greater magical power and more attention from suitors than she ever could, not to discredit her of her own prowess in using mesmerizing vocal commands to ensnare weak-willed men to do her bidding. This led her at one point many centuries ago to team up with Loki to trick Thor into awakening the terrible cyborg golem Mangog in an attempt to use him to conquer the Nine Realms, but due to her impatience and lack of planning, she was defeated and locked up in the dungeons by Sif. Years later, the disguised Amora would bail for her release so that she could reprimand her for her mistakes, then send her down to Midgard to ally herself with Creeper and his gang of idiots to provide a second chance to prove herself worthy of joining the big leagues for the eventual uprising against the entire cosmos.