Manda is a kaiju film monster which first appeared in Toho's 1963 film Atragon. Manda is based on a Japanese dragon. Manda does not have any special weapons, but can wrap its body around an enemy and crush them in the manner of a constrictor snake. Manda can also swim very fast and breathe underwater.
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.