Master Oogway is the overarching protagonist of the Kung Fu Panda franchise. He was an elderly Galápagos tortoise and the previous senior master of the Jade Palace. He is credited as the founder of the Valley of Peace, the creator of Kung Fu, and the developer of the Dragon Warrior legend.
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.
