Mystery Character: Who is it?

His unmistakable chuckle can be recognized by both children and adults alike with much ease. From his appearance in 1928 people around the world have come to recognize him over presidents, popes, and even Jesus. From his unchanged outfit and huge ears he embodies youth, innocence and imagination. His iconic image transcends cultures, nations, and borders with much acceptance. He has been a steamboat operator, military spokesman, explorer, apprentice, and a cowboy. With a band of easily recognizable friends including girlfriend he and them have will be written in the history books as being both influential and significant.