Gmork is the secondary antagonist of the first half of the 1979 German fantasy novel The Neverending Story by the late Michael Ende and the secondary antagonist of the 1984 fantasy film of the same name. He was the Nothing's former henchman.
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.