Yonggary is a giant monster originating from the 1967 South Korean film Yongary, Monster from the Deep. The film and its title character were produced to rival the success of Toho's Godzilla films during the mid-60s.
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.