Fan Casting Necronancy in Skylanders: Down to Earth DLC - Hunt for the Elements

A member of the Element Switchers. She's a ghostly skeletal necromancer has the ability to switch between the Undead and Magic elements, and joined the Element Switchers after becoming famous in her hometown for sealing the ghosts of unruly criminals into her Book of Souls. Her group of heroes has guarded the Isle of Elementals similarly to how the Skylanders guard the rest of the Skylands, and she happily teams up with them to stop the Titans. At least middle-aged.