Mickey Mouse is an American cartoon character co-created by Walt Disney and Ub Iwerks. The longtime icon and mascot of the Walt Disney Company. Mickey is an anthropomorphic mouse who typically wears red shorts, large yellow shoes, and white gloves.
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.