Pinocchio (1940 movie)
Jiminy Cricket (voiced by Cliff "Ukelele Ike" Edwards) became a more important character.  He was not included in the first version of the story.  When they added him, he looked more like a real cricket, but Walt wanted more people to like him, so Ward Kimball changed him into "a little man with no ears. That was the only thing about him that was like an insect."