Here is an example of the rarely seen model packs that were created for each episode of He-Man and She-Ra. These model packs were distributed to all the artists involved in the production of an episode. That said, the storyboard artists would often be working on the episode before the character models had been finalized. These designs were primarily used by the animators, given that there are numerous character turnarounds within. Quite often the layout department's backgrounds and suggested scenes would be included. You can see that this model pack for the She-Ra season one episode "Enemy With My Face" features numerous character models that appeared in the episode, along with model designs for devices, and vehicles.
(click on the image to see it at full-size)