Someone asked recently about the warthog characters that appear in the first Crash game in 1996. I dug up some images from the development of the warthog.
In the beginning he was conceived as a sumo wrestler. Naughty Dog decided they didn't want this guy and other incidental characters to emerge as full personalities. Instead they opted for simple versions of what the animal would look like in real life. These drawings are dated March 1995 back when Crash was a wombat named Willy.