I don't know why, but I love these little guys. Maybe because they didn't generally have to do anything but could just be in a scene and be more interesting than what was going on in the scene. They went through a lot of design changes through the years before getting the brown fur and black "fingers" they have today. Rizzo didn't have too much of a personality until Steve Whitmire became more comfortable with performing and speaking, making Rizzo go from a little scene-stealing rodent to one of the Muppets' main characters.