In the comic Amethyst: Princess of Gemworld, Princess Amethyst is orphaned at a young age and taken to Earth to be raised in safety. Upon her return to Gemworld, she discovers that not only is she a princess, but that she has powerful magical powers.
Raven is a half-demon, half-human being who joins the Teen Titans. She uses her powers of teleportation, astral projection, and empathic healing to protect Jump City from various villains, which includes her father Trigon. This costume will require a bit of DIY to replicate her cape pin and jeweled sleeves in addition to modifying the necklace into a belt.