The Iron Giant is the deuteragonist of the Warner Bros. 1999 animated science fiction film of the same name, voiced by Vin Diesel. He is a genial 50-foot tall autonomous "Metal Man" from another world that crash lands on Earth before becoming friends with a young boy named Hogarth who rescues him from his own internal defensive mechanism.
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.