Sarah Ravencroft is the titular overarching antagonist of the 1999 animated film Scooby-Doo! and the Witch's Ghost, the second installment of the Scooby-Doo direct-to-video film series.
Vote which fictional character would naturally fit in-universe with a big-named franchise! No time-travel, no interdimensional crap, no "Pooh's Adventures", they would just exist in-universe.
