Rex is a supporting character in the Toy Story franchise. He is a plastic Tyrannosaurus Rex, who served as the protagonist of Partysaurus Rex.
Rex is insecure about his lack of ferociousness, as he’s not scary enough and seems to just be annoying. Rex’s worst fear (after Sid) is that Andy may gain another, scarier dinosaur to replace him. Ironically, despite being portrayed as a ferocious Tyrannosaurus Rex, Rex is gentle, kind, caring, and hates any kind of argument or confrontation. He also lacks some intelligence and is extremely trusting and carefree