That, Sassagoula (awesome screenname by the way...), is Hoot Gibson. You may or may not have heard of the Western River Expedition, of which there is a considerable about of information on here and other places on the internet (
like here!). But in short, it was to be an original attraction for the Magic Kingdom in its early years, rather like a Pirates of the Caribbean but with a western, cowboy-and-indians theme. The attraction was cancelled to make way for the shortened version of Pirates we got today, but not before all of the development work and a certain amount of animatronic construction was done. One of those animatronics was Hoot Gibson, who was going to be something of a narrator/spiel announcer for the ride. Once the ride was cancelled, Hoot was repurposed and became part of an exhibit on Main Street used to display upcoming WDW attractions, which is what you see in that photograph. Western River Expedition may have been one of those attractions, but I'm not really sure. Others who actually witnessed Hoot Gibson (myself not being among them) while he was on display might be able to share greater detail, but that's the gist of it.
EDIT: Hey, well look what I found... a synopsis of the attractions Hoot Gibson was used to advertise, and even a complete spiel transcription of what he said.
Just go here and scroll to the bottom.