This "program" is called professional graphics artist
Well there is some 3D software that creates predefined stuff. Poser. And Creature Creator. Both not this expensive. You will also always notice that the Poser result is made with Poser. And just Poser or Creature Creator itself isnīt enough. The meshes needs a texture, you may want to animate it, render it. So there is a need to dive deeper into 3D ...
But donīt think that 2D is easier. Here you may not need to learn this much. But here is no software for predefined stuff around . And it takes eons to pixel a sprite with just a few animations ...