Hans Gruber is a fictional character and the main antagonist of the 1988 action film Die Hard, portrayed by Alan Rickman. Gruber is a thief and criminal mastermind from East Germany who holds the Nakatomi Plaza hostage to steal $640 million in negotiable bearer bonds.
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.