Rex is a plastic Tyrannosaurus Rex figure. Despite his portrayal as a ferocious Tyrannosaurus Rex, Rex is ironically gentle, kind, and caring, and he hates any argument or confrontation. Though his vocabulary is pretty strong, he is somewhat absent-minded and tends to cause accidental mayhem due to his size and obliviousness. Rex also suffers from anxiety. He fears being replaced or abandoned, either at the prospect of being thrown away or the arrival of a newer, more ferocious dinosaur toy. Despite his fears, he finds happiness and enjoyment in most things; one of his favorite pastimes includes playing video games with his friends, a hobby in which Rex has shown a fair amount of talent. With his childlike demeanor and lack of self-confidence, Rex is the most innocent of all the toys and shows the greatest desire to be loved and played with. Largely because of his innocence, he also can show himself to be very gullible. Despite his constant fear of rejection, he is a valued member of the gang and considered to be the most "ferocious" dinosaur toy a kid could ask for in the eyes of both Andy and Bonnie.